Dosage information is provided when it is available. However, because ingredients might not be standardized and many products contain proprietary blends of ingredients, the active compounds and their amounts might not be comparable among products [ 15 ]. The efficacy and safety of these ingredients might be different when they are combined with other ingredients in a product.

African mango, or Irvingia gabonensis , is a fruit-bearing tree that is native to western and central Africa [ 16 ]. Irvingia gabonensis seed kernel extract has been proposed to promote weight loss by inhibiting adipogenesis, as demonstrated in vitro [ 17 ].

In addition, a proprietary extract of Irvingia gabonensis , IGOB, reduces serum levels of leptin [ 18 ], a hormone that is positively correlated with body weight and percentage body fat [ 19 ]. IGOB might also reduce total cholesterol and low-density lipoprotein LDL levels [ 18 ]. Studies have examined the effects of Irvingia gabonensis on weight loss to only a limited extent in humans.

Participants who received the extract had significantly lower body weight, body fat, and waist circumference at the end of the trial than those taking a placebo. This trial, along with two others, was included in a systematic review whose authors reported that Irvingia gabonensis extract causes statistically significant reductions in body weight and waist circumference [ 19 ].

The authors noted, however, that the trials included in the review used different study methodologies, small samples, short intervention periods, and varying daily doses of Irvingia gabonensis extract mg to 3, mg ; in addition, the trials were all conducted by the same authors.

Additional trials with larger samples and diverse populations are needed to determine whether Irvingia gabonensis extract is effective for weight loss [ 19 ]. Irvingia gabonensis extract appears to be well tolerated. Most reported adverse effects are mild, including headache, difficulty sleeping, flatulence, and gas [ 19 ].

However, Irvingia gabonensis has been associated with renal failure in a patient with chronic kidney disease [ 21 ].

Beta-glucans are glucose polysaccharides found in bacteria, yeasts, fungi, and cereal grains such as oats and barley.

As soluble dietary fibers, beta-glucans are proposed to increase satiety and gastrointestinal transit time and to slow glucose absorption [ 16 ]. Consumption of beta-glucans from barley has been shown to reduce energy intake and appetite in humans [ 22 ].

Several studies have investigated the effects of beta-glucans on blood lipids, blood pressure, and insulin resistance, with weight loss as a secondary outcome.

In one of these studies, 66 women who were overweight followed a low-calorie diet designed to produce a 0. At the end of the trial, all groups lost weight and had a smaller waist circumference, but there were no significant differences between groups.

Beta-glucans appear to be well tolerated. Reported adverse effects include increased flatulence but not changes in stool consistency, stool frequency, or bloating [ 24 ]. Bitter orange is the common name for the botanical Citrus aurantium. The fruit of this plant is a source of p-synephrine often referred to simply as synephrine and other protoalkaloids [ 28 ].

As alpha-adrenergic agonists, synephrine alkaloids can mimic the action of epinephrine and norepinephrine. However, the extent to which bitter orange and synephrine cause similar cardiovascular and central nervous system effects to epinephrine and norepinephrine e.

Studies suggest that bitter orange increases energy expenditure and lipolysis and that it acts as a mild appetite suppressant [ 25 , 27 ]. After FDA banned the use of ephedrine alkaloids in dietary supplements in [see section on ephedra má huáng ], manufacturers replaced ephedra with bitter orange in many products; thus, bitter orange became known as an ephedra substitute [ 29 ].

Although synephrine has some structural similarities to ephedrine, it has different pharmacological properties [ 27 , 30 ]. Several small human studies have examined whether bitter orange is effective for weight loss [ 30 ]. Interpreting the results of these studies is complicated by the fact that bitter orange is almost always combined with other ingredients in weight-loss supplements.

At the end of the study, participants taking the combination bitter orange product had a significantly greater reduction in percent body fat and fat mass and a greater increase in basal metabolic rate than those in the placebo and control groups.

Participants in all groups lost weight, but the authors did not report whether the mean reduction in body weight in the treatment group 1. The peak rise in resting metabolic rate at baseline was significantly higher in participants taking the herbal supplement than those in the placebo group, but the difference was not significant at the end of the 8-week study.

Participants taking the herbal supplement had a significant increase in mean body weight 1. However, this increase in body weight did not significantly affect body fat and lean tissue levels or waist circumference.

The authors noted that the weight gain might have occurred by chance because the trial was insufficiently powered to detect this small difference. The authors of a review of 23 small human clinical studies involving a total of participants concluded that synephrine increases resting metabolic rate and energy expenditure [ 30 ].

According to all of these reviews, longer term clinical trials with rigorous designs and large samples are needed to determine the value of bitter orange for weight loss. Products containing bitter orange may have significant safety concerns. Reported adverse effects include chest pain, headache, anxiety, elevated heart rate, musculoskeletal complaints, ventricular fibrillation, ischemic stroke, myocardial infarction, and death [ 34 , 35 ].

However, many of the products with these effects contain multiple herbal ingredients, and the role of bitter orange in these adverse effects cannot be isolated. Some studies indicate that bitter orange and synephrine—as bitter orange extract or pure synephrine—raise blood pressure and heart rate, but other studies show that they do not have these effects [ , 31 , ].

Some researchers have suggested that synephrine might not act directly as a cardiovascular stimulant [ 27 , 37 , 39 ]. Instead, caffeine, other stimulants in multicomponent formulations, and other constituents of bitter orange or adulterants such as m-synephrine, which is not naturally present in bitter orange might be responsible for its observed effects.

Many dietary supplements promoted for weight loss contain added caffeine or an herbal source—such as guarana Paullinia cupana , kola or cola nut Cola nitida , and yerba maté Ilex paraguariensis —that naturally contains caffeine.

Green tea and other forms of tea also contain caffeine see section on green tea. Some weight-loss supplement labels do not declare the amount of caffeine in the product and only list the herbal ingredients. As a result, consumers might not be aware that the presence of certain herbs means that a product contains caffeine and possibly other stimulants [ 41 ].

Caffeine is a methylxanthine that stimulates the central nervous system, heart, and skeletal muscles. It also increases gastric and colonic activity and acts as a diuretic [ 42 , 43 ].

Caffeine has a half-life of about 6 hours; blood levels increase within 15—45 minutes of consumption, and they peak at around 60 minutes [ 44 ]. Caffeine increases thermogenesis in a linear, dose-dependent fashion in humans [ 45 ].

A mg dose of caffeine, for example, increased energy expenditure by a mean of 9. Caffeine might also contribute to weight loss by increasing fat oxidation through sympathetic activation of the central nervous system and by increasing fluid loss [ 41 , 45 ].

Habitual use of caffeine however, leads to caffeine tolerance and a diminishment of these effects [ 41 , 43 ]. Caffeine increases energy expenditure and fat oxidation [ 44 ]. However, the extent to which these effects affect weight loss is less clear, partly because clinical trials examining the effects of caffeine on weight loss have all been short and have used combination products.

After 6 months, those in the treatment group lost significantly more weight mean weight loss 5. A product containing caffeine plus glucosyl hesperidin G-hesperidin, a flavonone glycoside found mainly in citrus fruits reduced abdominal fat and BMI in a clinical trial in Japan [ 47 ].

In this study, 75 healthy men and women who were overweight BMI 24—30 received one of five treatments daily for 12 weeks while maintaining their regular lifestyle and eating habits.

The five treatments were placebo and four formulations of 0, 25, 50, or 75 mg caffeine plus mg G-hesperidin.

The 75 mg caffeine plus G-hesperidin significantly reduced BMI by a mean of 0. The 50 or 75 mg caffeine plus G-hesperidin also significantly reduced abdominal fat compared to placebo, whereas the G-hesperidin alone or with only 25 mg caffeine did not significantly affect BMI or abdominal fat.

These findings indicate that the higher doses of caffeine might be responsible for the observed effects. At the end of the study, participants taking the herbal product lost a mean of 5.

Data from a year prospective observational study provide some insight into the long-term association between caffeine intake and body weight [ 49 ]. On average, participants gained some weight during the study, but men who increased their caffeine intake during the 12 years of follow-up gained a mean of 0.

For women, the corresponding mean difference in weight gain was 0. However, further research is needed to confirm this finding. For comparison, an 8-ounce cup of brewed coffee contains about 85— mg caffeine. Caffeine can cause sleep disturbances and feelings of nervousness, jitteriness, and shakiness.

Combining caffeine with other stimulants, such as bitter orange and ephedrine, can potentiate these adverse effects. Calcium is an essential mineral that is stored in the bones and teeth, where it supports their structure and function. Calcium is required for vascular contraction and vasodilation, muscle function, nerve transmission, intracellular signaling, and hormonal secretion [ 56 ].

Several studies have correlated higher calcium intakes with lower body weight or less weight gain over time [ ]. Two explanations have been proposed. First, high calcium intakes might reduce calcium concentrations in fat cells by decreasing the production of parathyroid hormone and the active form of vitamin D.

Decreased intracellular calcium concentrations, in turn, might increase fat breakdown and discourage fat accumulation in these cells [ 59 ]. Second, calcium from food or supplements might bind to small amounts of dietary fat in the digestive tract and prevent absorption of this fat [ 59 , 62 , 63 ].

Dairy products, in particular, might contain additional components that have even greater effects on body weight than their calcium content alone would suggest [ 60 , ]. For example, protein and other components of dairy products might modulate appetite-regulating hormones [ 61 ].

However, the results from clinical trials examining the effects of calcium on body weight have been largely negative.

Compared to placebo, calcium supplementation for 2 years had no clinically significant effects on weight. The authors of four reviews of published studies on the effects of calcium from supplements or dairy products on weight management reached similar conclusions [ ].

These reviews include a evidence report from the Agency for Healthcare Research and Quality whose authors concluded that, overall, clinical trial results do not support an effect of calcium supplementation on weight [ 70 ]. In addition, a meta-analysis of 41 randomized controlled trials found no benefit of calcium supplementation or increased dairy food consumption for body weight or body fat [ 73 ].

A meta-analysis of 33 randomized trials and longitudinal studies lasting 12 weeks to 6 years found that calcium from foods or supplements had no overall effect on body weight [ 74 ].

However, in subgroup analyses, calcium did reduce body weight in some groups, including children, adolescents, adult men, premenopausal women, women older than 60, and people with normal BMI [ 74 ].

Overall, the results from clinical trials do not support a clear link between higher calcium intakes and lower body weight, prevention of weight gain, or weight loss.

High intakes of calcium can cause constipation and might interfere with the absorption of iron and zinc, although this effect is not well established. High intakes of calcium from supplements, but not foods, have been associated with an increased risk of kidney stones [ 56 , ].

Capsaicinoids give chili peppers their characteristic pungent flavor. Capsaicin is the most abundant and well-studied capsaicinoid [ 78 ]. Capsaicin and other capsaicinoids have been proposed to have anti-obesity effects via their ability to increase energy expenditure and lipid oxidation, attenuate postprandial insulin response, increase satiety, and reduce appetite and energy intake [ ].

Other research suggests that capsaicin increases satiety by inducing gastrointestinal distress e. Most research on capsaicin and other capsaicinoids focuses on their effects on energy intake and appetite, rather than body weight.

A meta-analysis of eight randomized, placebo-controlled clinical trials evaluated the effects of capsaicinoids on ad libitum energy intake in a total of participants who had a normal body weight or were moderately overweight [ 78 ]. Doses of capsaicinoids ranged from 0.

Overall, consuming capsaicinoids significantly reduced energy intake by a mean of 74 kcal per meal; body weight was not assessed, so the impact of this calorie reduction on weight loss cannot be quantified. The authors noted that the results suggest that at least 2 mg capsaicinoids are needed to reduce calorie intake but that the studies were very heterogeneous.

However, the calorie reductions did not significantly affect body weight at either 6 weeks or 12 weeks. It might also increase serum insulin and reduce high-density lipoprotein HDL cholesterol levels.

Otherwise, capsaicin and other capsaicinoids appear to be safe. Research is underway to reduce the pungency and chili taste associated with capsaicin while retaining its potential biological effects [ 81 ]. Carnitine is the generic term for several compounds, including L-carnitine itself, several acylcarnitines e.

It is composed of the amino acids lysine and methionine [ 84 ]. Carnitine is naturally present in animal products such as meat, fish, poultry, and milk and dairy products; small amounts are present in some plant foods. Humans synthesize carnitine from its constituent amino acids, so dietary carnitine intake is not necessary.

Almost all cells of the body contain carnitine, which transports fatty acids into the mitochondria and acts as a cofactor for fatty acid beta-oxidation [ 85 ].

Because of these effects, carnitine has been proposed as a weight-loss agent. A systematic review and meta-analysis combined the results from nine carnitine supplementation clinical trials in adults including the two described above that assessed weight loss [ 85 ].

The trials included a total of participants. In eight trials, the daily carnitine doses ranged from 1. Overall, study participants who received carnitine supplements lost an average of 1.

Additional research on carnitine for weight loss is warranted. Rarer side effects include muscle weakness in patients with uremia and seizures in those with seizure disorders.

Some research indicates that intestinal bacteria metabolize carnitine to form trimethylamine N-oxide TMAO , a substance that might increase the risk of cardiovascular disease [ 91 ].

This effect appears to be more pronounced in people who consume meat than in vegans or vegetarians. The implications of this effect are not well understood and require more research.

Chitosan is a manufactured polysaccharide that is commercially prepared from the exoskeletons of crustaceans. It is purported to promote weight loss by binding to some dietary fat in the digestive tract, preventing its absorption [ 16 , 41 ]. Chitosan might also decrease cholesterol absorption [ 16 ].

Chitosan capsules taken before meals total of 2. However, the amount of fat that the chitosan trapped would result in a loss of only 1 lb body fat over about 7 months.

Chitosan had no significant effect on fecal fat excretion in the women compared to the control group. At the end of the study, those in the treatment group lost a mean of 1 kg body weight compared to a mean weight gain of 1.

In this study, chitosan treatment reduced body weight mean weight loss about 2. The authors of a Cochrane Review that included 13 trials examining the effect of chitosan on body weight found that chitosan, when taken for 4 weeks to 6 months, reduced body weight by a mean of 1.

They concluded that chitosan appears to be more effective than placebo for short-term weight loss, but most studies have been of poor quality.

The authors also noted that results from high-quality trials indicate that chitosan has minimal effects on body weight, and these effects are probably clinically insignificant. The adverse effects of chitosan are minor and primarily involve the gastrointestinal tract. They include flatulence, bloating, mild nausea, constipation, indigestion, and heartburn [ 93 , 95 , 96 ].

Because chitosan is derived from shellfish, people who are allergic to shellfish could theoretically be allergic to chitosan [ 97 ].

The trivalent form of chromium chromium III is an essential trace mineral that potentiates the action of insulin. Dietary supplements commonly contain chromium in the form of chromium picolinate, which consists of chromium and picolinic acid, although they might also contain other forms, including chromium nicotinate and chromium yeast [ 99 ].

Poor chromium status might contribute to impaired glucose tolerance and type 2 diabetes [ 98 ]. Researchers have hypothesized that chromium supplements increase lean muscle mass and promote fat loss, but study results have been equivocal [ 41 , ].

Some research indicates that these supplements might also reduce food intake, hunger levels, and fat cravings [ ], although data on these effects are sparse. Several studies have evaluated the effects of chromium supplements, usually in the form of chromium picolinate, on weight loss.

Six of the trials included resistance or weight training, and three did not. Chromium picolinate supplementation reduced body weight by 1. Also in , a systematic review and meta-analysis of 11 randomized controlled trials including most of the trials evaluated in the Cochrane Review examined the effects of chromium supplementation in a total of individuals with overweight or obesity [ 99 ].

The authors concluded that daily doses of to 1, mcg chromium for 8 to 26 weeks reduce body weight by 0. Like the authors of the Cochrane Review, these authors noted that the effect is small and of "uncertain" clinical relevance.

Similar findings were reported from an earlier meta-analysis of 12 trials [ ]. Trivalent chromium appears to be well tolerated. Adverse effects from clinical trials include watery stools, headache, weakness, nausea, vomiting, constipation, vertigo, and urticaria hives [ 99 , ].

Chromium does not have an established UL because few serious adverse effects have been linked to high intakes [ 98 ]. Hexavalent chromium chromium VI is toxic and not found in food or dietary supplements. Forskolin is a compound isolated from the roots of Coleus forskohlii , a plant that grows in subtropical areas, such as India and Thailand.

Forskolin is purported to promote weight loss by enhancing lipolysis and reducing appetite [ , ], possibly by stimulating cyclic adenosine monophosphate cAMP production. This increased cAMP production, in turn, is thought to activate lipase and promote the release of fatty acids from adipose tissue [ 16 ].

Although animal studies indicate that forskolin reduces food intake [ , ], research in humans is very limited and inconclusive.

Compared to placebo, Coleus forskohlii extract had no effect on body weight, appetite, caloric intake, or macronutrient intake. In a study in mice, Coleus forskohlii extract caused dose-dependent hepatotoxicity, but pure forskolin did not have this effect, suggesting that other component s of Coleus forskohlii extract might be responsible for the hepatotoxicity [ ].

Forskolin has not been evaluated in longer term trials. Additional research is needed to better understand the safety and side effects of both short- and long-term use. Conjugated linoleic acid CLA is a mixture of linoleic acid isomers containing conjugated double bonds that is present mainly in dairy products and beef.

The various isomeric forms of CLA include c9,tCLA and t10,cCLA, and it is available in dietary supplements as a triacylglycerol or as a free fatty acid [ ]. Researchers have suggested that CLA enhances weight loss by increasing lipolysis and fatty acid oxidation in skeletal muscle, reducing lipogenesis, and promoting apoptosis in adipose tissue [ 17 , ].

Although CLA appears to reduce body fat mass in animals [ 17 ], results from human studies suggest that its effects are small and of questionable clinical relevance [ ]. One double-blind, placebo-controlled trial evaluated the effects of CLA supplementation as a mixture of c9,tCLA and t10,cCLA in male and female volunteers who were overweight BMI 25—30 consuming an ad libitum diet [ ].

Participants received CLA as a free fatty acid 3. At the end of the study, body fat mass dropped by significant amounts with both forms of CLA compared with placebo; reductions, on average, were 6.

Supplementation with CLA as a free fatty acid but not as a triacylglycerol also increased lean body mass compared with placebo.

In another double-blind crossover trial, daily supplementation with CLA oil 6. These findings are similar to those from a randomized, double-blind, placebo- controlled trial in 63 adults with overweight or obesity BMI 24—35 that found statistically significant, but small, reductions in mean weight 0.

In contrast, those in the placebo group did not lose a significant amount of body weight 0. However, 3. The authors of a systematic review and meta-analysis of seven randomized controlled trials concluded that taking 2. However, the authors noted that the "magnitude of these effects is small, and the clinical relevance is uncertain.

CLA appears to be well tolerated. Most reported adverse effects are minor, consisting mainly of gastrointestinal disturbances, such as abdominal discomfort and pain, constipation, diarrhea, loose stools, nausea, vomiting, and dyspepsia [ 3 , , , , , ]. CLA might also increase some markers of oxidative stress and decrease breastmilk fat levels, but additional research is needed to confirm these effects [ ].

CLA has been linked to hepatitis in three case reports [ ]. However, whether CLA caused this toxicity cannot be definitively established because the products were not analyzed to rule out the presence of a contaminant.

CLA might adversely affect lipid profiles, although results from studies are inconsistent. Some research indicates that CLA has no major effect on lipid profiles, but other research shows that certain CLA isomers might decrease HDL cholesterol and increase lipoprotein a levels [ , , , ].

The CLA isomer t10,cCLA has also been reported to increase insulin resistance and glycemia in men with obesity and metabolic syndrome [ , ]. Fucoxanthin is a carotenoid in brown seaweed and other algae. Results from laboratory and animal studies suggest that fucoxanthin might promote weight loss by increasing resting energy expenditure and fatty acid oxidation as well as by suppressing adipocyte differentiation and lipid accumulation [ , ].

Only one clinical trial has been conducted on the possible weight-loss effects of fucoxanthin. This week trial used Xanthigen, a dietary supplement containing brown seaweed extract and pomegranate-seed oil [ ].

Compared to the placebo group, those receiving Xanthigen lost significantly more body weight by the end of the trial mean loss of 6. The safety of fucoxanthin has not been thoroughly evaluated in humans. Although participants using Xanthigen in the clinical trial described above reported no adverse effects [ ], further investigation of the safety and potential side effects of fucoxanthin at various levels of intake is required.

Garcinia cambogia is a fruit-bearing tree that grows throughout Asia, Africa, and the Polynesian islands [ ]. The pulp and rind of its fruit contain high amounts of hydroxycitric acid HCA , a compound that has been proposed to inhibit lipogenesis, increase hepatic glycogen synthesis, suppress food intake, and reduce weight gain [ 6 , 15 , , , ].

Studies in rats have found that Garcinia cambogia suppresses food intake and inhibits weight gain [ 3 ]. In humans, however, the evidence on whether Garcinia cambogia or HCA is effective for weight loss is conflicting, and any effects it has appear to be small [ 6 , 17 , ].

In one randomized, placebo-controlled trial, 89 women who were mildly overweight mean BMI Women receiving Garcinia cambogia lost significantly more weight 3. However, Garcinia cambogia did not alter appetite, and the study produced no evidence that the supplement affected feelings of satiety.

Participants in both groups lost weight, but the between-group weight-loss differences were not statistically significant. HCA also had no effect on body fat loss.

A review and meta-analysis of 12 randomized controlled trials with a total of participants examined the effects of Garcinia cambogia on weight loss [ ]. Therefore, the effect of Garcinia cambogia on body weight remains uncertain. The reported adverse effects of Garcinia cambogia and HCA are generally mild and include headache, nausea, upper respiratory tract symptoms, and gastrointestinal symptoms [ , , ].

However, dietary supplements containing Garcinia cambogia have been implicated in three cases of mania, which might have been caused by the serotonergic activity of HCA [ ]. Symptoms included grandiosity an unrealistic sense of superiority , irritability, pressured speech, and decreased need for sleep.

Reports have also described 10 cases of liver toxicity, resulting in one death and two liver transplants, in people taking products containing Garcinia cambogia [ 43 , ].

In most of these cases, the products contained other botanical ingredients and minerals as well, so the toxicity cannot be definitively attributed to Garcinia cambogia. Because all clinical trials of Garcinia cambogia and HCA have been short, its long-term safety is unknown.

Glucomannan is a soluble dietary fiber derived from konjac root Amorphophallus konjac that can absorb up to 50 times its weight in water [ 16 ]. Like guar gum, glucomannan has been proposed to increase feelings of satiety and fullness and prolong gastric emptying by absorbing water in the gastrointestinal tract [ 16 , , ].

It might also reduce fat and protein absorption in the gut [ 16 ]. Glucomannan appears to have beneficial effects on blood lipids and glucose levels [ ], but its effects on weight loss are inconsistent.

At the end of the study, glucomannan produced significantly greater weight loss mean loss of 2. In another study conducted in the United States, supplementation with glucomannan 3.

Eight weeks of glucomannan supplementation 1. The authors of a systematic review of six randomized controlled trials with a total of participants concluded that 1.

Similarly, a meta-analysis of eight trials that included participants found that glucomannan did not significantly affect weight loss compared to placebo [ ]. The authors of an older meta-analysis of 14 studies designed primarily to investigate glucomannan's effect on lipid and blood glucose levels concluded that 1.

Little is known about the long-term safety of glucomannan. Glucomannan appears to be well tolerated for short-term use, with minor adverse effects, including belching, bloating, loose stools, flatulence, diarrhea, constipation, and abdominal discomfort [ , , , ].

The use of tablet forms of glucomannan was reported to be associated with seven cases of esophageal obstruction in — in Australia [ 99 ].

Users should therefore be cautious when taking glucomannan tablets. Powdered and capsule forms have not been associated with this effect [ ].

The seeds or beans of the coffee plant Coffea arabica, Coffea canephora, Coffea robusta are green until they are roasted. Compared to roasted beans, green coffee beans have higher levels of chlorogenic acid. Green coffee extract, probably because of its chlorogenic acid content, inhibits fat accumulation in mice and humans by regulating adipogenesis.

Green coffee extract also modulates glucose metabolism [ ], perhaps by reducing glucose absorption in the gut [ ]. Green coffee beans contain caffeine see section on caffeine above [ ], although decaffeinated forms are available [ 16 ].

In mice, green coffee bean extract in combination with a high-fat diet significantly reduced body weight gain and fat mass [ , ]. Only a few clinical trials have examined the effects of green coffee bean extract on weight loss in humans, and all were of poor methodological quality.

The researchers concluded that green coffee bean extract has a moderate but significant effect on body weight mean weight loss of 2. The authors of another small clinical trial claimed to show a benefit of green coffee bean extract for weight loss [ ], but the study was strongly criticized by the FTC for having several critical flaws in its design [ , ].

Two of the three study authors subsequently retracted the journal publication. Green coffee bean extract appears to be well tolerated, but its safety has not been rigorously studied. Reported adverse effects include headaches and urinary tract infections [ ].

The caffeine naturally present in green coffee beans acts as a stimulant and can cause adverse effects, depending on the dose and whether it is combined with other stimulants see section on caffeine above. Green tea Camellia sinensis is a popular beverage consumed worldwide that has several purported health benefits [ ].

Green tea is present in some dietary supplements, frequently in the form of green tea extract. The active components of green tea that are associated with weight loss are caffeine see section on caffeine above and catechins, primarily epigallocatechin gallate EGCG , which is a flavonoid [ 41 , ].

A typical brewed cup of green tea has about — mg catechins [ ] and 45 mg caffeine. It has been suggested that green tea and its components might reduce body weight by increasing energy expenditure and fat oxidation, reducing lipogenesis, and decreasing fat absorption [ 41 , ].

Green tea might also decrease carbohydrate digestion and absorption [ ]. Available green tea extracts cover the range from minimally processed tea leaves to highly processed, manufactured concentrates of single constituents, such as EGCG.

The authors of a meta-analysis of six randomized controlled trials with a total of 98 participants found that caffeine alone or in combination with catechins significantly increases energy expenditure in a dose-dependent fashion compared with placebo [ ].

This effect might be important for maintaining weight loss by helping counteract the decrease in metabolic rate that can occur during weight loss. Catechins combined with caffeine also significantly increase fat oxidation, but caffeine alone does not. Other human research indicates that EGCG alone does not increase resting metabolic rate, fat oxidation, or the thermic effect of feeding the increase in metabolic rate associated with the digestion and absorption of food [ , ].

Taken together, these findings suggest that green tea catechins and caffeine might act synergistically [ 41 , , ]. Several human studies have examined the effects of green tea catechins on weight loss and weight maintenance. A Cochrane Review analyzed the results from 14 randomized controlled trials of green tea preparations in a total of 1, participants with overweight or obesity [ ].

The trials lasted from 12 to 13 weeks, and doses of green tea catechins ranged from to 1, mg; in 10 of the 14 trials, the green tea preparations contained caffeine. Green tea supplementation reduced body weight by a mean of 0. However, when the authors analyzed the six studies that were conducted outside of Japan where study methodologies were less heterogeneous than in the Japanese studies , they found no statistically significant difference in weight loss for green tea compared to placebo.

The authors reported that green tea catechins combined with caffeine over a median of 12 weeks modestly yet significantly reduced body weight by a mean of 1. Only two studies in this meta-analysis examined the effects of green tea catechins alone. Their results suggest that green tea catechins alone do not affect body weight or other anthropometric measurements.

A meta-analysis of 11 randomized controlled trials found that people who took EGCG combined with caffeine for 12—13 weeks lost a mean of 1. In , EFSA examined health claims related to green tea and concluded that "a cause and effect relationship has not been established between the consumption of catechins including EGCG from green tea … and contribution to the maintenance or achievement of a normal body weight" [ ].

Taken together, the findings of these studies suggest that if green tea is an effective weight-loss aid, any effect it has is small and not likely to be clinically relevant [ , ]. See Phen24 Reviews.

This twenty-four-hour system includes two different pills, one for the morning and one for the evening. The daytime pill, for example, increases metabolism and energy while decreasing appetite, while the nighttime pill decreases food cravings and cortisol levels to help with weight management and better sleep.

The ingredients are clean and transparent and include vitamins and minerals to enhance your overall health in addition to the weight loss features.

See TrimTone Reviews. TrimTone is the simplest pill on this list. It works through appetite suppression, fat burning, and increasing energy and focus.

However, it has a large amount of caffeine and other stimulants, which women can be more sensitive to than men. Since every person reacts differently to various compounds, the best way to choose pills is to try them and see what works.

Green tea extract [2] boosts thermogenesis, especially when combined with exercise and other parts of a healthy lifestyle. In addition, it improves glucose tolerance [3] and helps oxidize fat.

Studies have shown that caffeine can help you lose weight , [4] but mostly when accompanied by a healthy diet and exercise. It aids in speeding up your metabolism, making exercise more effective. This is a difficult-to-pronounce ingredient derived from plants that have been cultivated for medicine in China for a long time.

There are prescription weight loss drugs , [5] which are often more effective than the over-the-counter version if your physician agrees you should use them. The alternative natural weight loss pills can be better if you want organic compounds and try to avoid synthesized chemicals as in prescription medications.

Whether you choose prescription weight loss drugs or not is up to you and your preference. Always take the recommended dose. This is a difficult question to answer since it varies depending on the brand and the ingredients. There are a lot of different dietary supplements to help you lose weight on the market, but we hope this guide helps you select the best options for yourself and your lifestyle!

All three are alternatives to the brand Phentermine, a prescription weight loss medication. You should definitely not do that! These pills are designed to work alone, and most of them use the same ingredients so that you could get much too high a dose.

Keep an eye out for adverse effects. Stop taking the supplements or find a different brand if you need to. EHproject has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations.

We work mostly with peer-reviewed studies to ensure accurate information. We avoid using tertiary references. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

Christine is a certified personal trainer and nutritionist with an undergraduate degree from Missouri State University. Her passion is helping others learn how strong and healthy they can become by transforming their daily habits.

Christine spends… See More. Expert's opinion We believe information about products and services that could benefit people should be made available to consumers to help them make informed decisions about their health care.

Check Price See PhenQ Reviews. Vegan Good money-back guarantee Few side effects No synthetic additives Free shipping globally Not suitable for children or pregnant or nursing mothers Has a large amount of caffeine.

Check Price See LeanBean Reviews. Formulated for women Caffeine-free Vegan, gluten-free, soy-free, non-GMO, and organic Testing results are available online day money-back guarantee Complicated return policy Six pills each day Results can be delayed and may vary.

Instant Knockout. Check Price See Instant Knockout Reviews. Check Price See PhenGold Reviews. Good money-back guarantee FDA registered facility Fast and reliable shipping No proprietary, secret ingredients High concentration of caffeine Can be expensive The availability is limited to certain countries.

Check Price See PrimeShed Reviews. Lose excess weight without losing muscle Backed by clinical research Naturally grown, soy-free, gluten-free, non-GMO, and vegan Sometimes causes upset stomachs Can be expensive Not safe for pregnant or breastfeeding women.

Check Price See Phen24 Reviews. Check Price See TrimTone Reviews. Made for women Suppresses the appetite Only one pill a day Not vegan Not safe for pregnant or breastfeeding women High levels of stimulants such as caffeine. Frequently Asked Questions FAQs.

Are PhenQ, PhenGold, and Phen24 related? Can you take more than one weight loss supplement? My weight loss supplements are making me feel sick? Himms-Hagen, J. Role of thermogenesis in the regulation of energy balance in relation to obesity.

Canadian Journal of Physiology and Pharmacology , [online] 67 4 , pp. Sabu Mandumpal Chacko, Thambi, P. Beneficial effects of green tea: A literature review.

Chinese Medicine , [online] 5 1 , pp. Venables, M. and Jeukendrup, A.

The moment you introduce FitSpresso into your regimen, it works wonders. Users report a noticeable boost in energy levels, a vital component in sustaining an active lifestyle essential for weight loss.

This surge in vitality is complemented by an enhanced metabolic rate, a crucial factor in accelerating fat-burning processes. The result? An improved physique that looks good and feels fantastic, offering users a renewed zest for life.

What truly sets FitSpresso apart is its holistic approach to weight loss. This commitment to lasting change resonates deeply with those on the rollercoaster of weight fluctuations, seeking a more permanent solution.

Its production in an FDA-approved and GMP-certified facility supports this acclaim, ensuring the highest quality and safety standards.

Moreover, the capsules are easy to swallow, a subtle yet significant detail that enhances user experience. This unique blend of efficacy, safety, and reliability makes FitSpresso a leading option for anyone seeking a natural, effective solution to weight loss.

LumaLite emerges as a groundbreaking entry in our list of top weight loss supplements, boasting a unique approach to weight management. This innovative formula positions LumaLite as a trailblazer in the weight loss industry. The core mechanism of LumaLite centers on balancing IL-6, a protein produced by fat cells that signals the body to store and retain fat.

When made in excess, IL-6 can significantly increase fat storage, particularly in stubborn areas. This overproduction creates a cascade effect, triggering a surge in fat-storing hormones.

The supplement supports metabolic health, energy levels, and brain function, contributing to well-being. It also aids in maintaining healthy blood sugar levels, an essential factor in weight management and general health. Its production in an FDA-approved and GMP-certified facility underscores its commitment to quality and safety.

Puravive stands out as a uniquely pure and potent player in the weight loss supplement arena, embodying the essence of nature in its formulation. The central philosophy of Puravive revolves around boosting brown adipose tissue BAT levels in the body.

Recent groundbreaking research from Germany has uncovered a startling link between low levels of BAT and the accumulation of belly fat. A common thread was discovered in a comprehensive study involving over 52, individuals: those struggling with excess body fat consistently showed lower levels of brown adipose tissue.

Puravive addresses this issue head-on, harnessing its natural ingredients and prodigious calorie burners to elevate BAT levels. From improving energy levels and brain function to supporting cardiovascular health, blood flow, and healthy blood sugar and cholesterol levels, Puravive is a holistic approach to wellness.

Produced in an FDA-approved and GMP-certified facility, it is easy to swallow, non-habit-forming, and free from unwanted side effects. PhenQ emerges as a dynamic force in the weight loss supplement market, distinguishing itself with a formula as effective as innovative.

In a relatively short period, PhenQ has significantly impacted over , customers on their weight loss journeys while allowing them to indulge in their favorite treats occasionally. This balance of effectiveness and flexibility is what sets PhenQ apart. Its natural formulation supports various aspects of weight loss, from accelerating metabolism to crushing cravings, facilitating all-natural and sustainable weight reduction.

Produced in the US and UK in GMP-approved facilities, PhenQ ensures high-quality standards. Its formulation is a testament to modern advancements in natural weight loss solutions, offering a holistic, efficient, and versatile approach to shedding pounds without sacrificing the joys of occasional treats.

Alpilean introduces a refreshing twist in the weight loss supplement landscape, unveiling the secret of Alpine wellness for effective weight management. Its uniqueness lies in targeting a groundbreaking discovery: low inner body temperature is the root cause of slow metabolism and stubborn belly fat.

This innovative approach sets Alpilean apart, offering a new dimension to weight loss strategies. Its plant-based ingredients ensure compatibility with various lifestyles and dietary preferences. By optimizing internal body temperature, it enhances metabolic efficiency, leading to more effective calorie burning.

This process, in turn, supports a healthier, more active metabolism, which is crucial for long-term weight management. Users report additional advantages, including improved mood, better sleep quality, reduced cravings for unhealthy foods, and a noticeable increase in energy levels.

These benefits collectively contribute to overall well-being, making weight loss a more enjoyable and sustainable journey. Easy to take in capsule form and requiring no prescription, Alpilean is accessible and convenient. Its affordability and extra perks and bonuses add to its appeal.

In a market where finding a reliable, effective weight loss solution can be daunting, Alpilean stands out as a trustworthy option, promising weight loss and a journey towards improved overall health.

Rounding off our exclusive list of best weight loss pills is Liv Pure, a game-changer in the realm of health and wellness. It features a unique dual-complex system: the Liver Purification Complex and the Fat-Burning Complex.

Each blend is a meticulously crafted concoction of Mediterranean plants and super nutrients, supporting and optimizing liver function. The Liver Purification Complex offers a detoxifying power vital for a liver burdened by everyday toxins.

By cleansing the liver, it sets the stage for enhanced metabolic health. On the other hand, the Liver Fat-Burning Complex is a metabolic booster, targeting fat in those notoriously stubborn areas.

This two-pronged approach ensures that Liv Pure not only aids in weight loss but also elevates overall vitality. Take control of your weight management with Liv Pure, the ultimate solution for maintaining a healthy liver.

Liv Pure proves that a healthy liver is the foundation for a healthy weight. Understanding that everything consumed eventually passes through the liver, Liv Pure ensures that it functions optimally, deciding whether food is used as energy or stored as fat.

Liv Pure naturally enhances energy, fat-burning, and metabolic rate by focusing on liver health. Liv Pure is manufactured in an FDA-approved and GMP-certified facility and ensures the highest quality standards. With over , lives transformed, from young adults to those in their golden years, Liv Pure is a beacon of hope for those seeking a natural, practical path to weight loss and improved well-being.

In the constantly evolving health and fitness world, navigating claims and counterclaims to find the best weight loss pills can feel like a labyrinth.

To provide clarity and trustworthy guidance, we embarked on a meticulous journey to rank these supplements. Our approach was holistic, rigorous, and grounded in the key factors below, ensuring our recommendations are effective, safe, and sustainable:.

At the foundation of our evaluation was scientific evidence. The caliber of ingredients is crucial. We delved into the source, quality, and purity of ingredients used in each supplement. Only those with high-quality, natural ingredients, free from harmful additives, made our list. We assessed their effectiveness by examining user testimonials, before-and-after scenarios, and documented case studies, looking for consistent and sustainable weight loss results.

A critical aspect of our ranking process was the safety profile of each supplement. We thoroughly examined the potential side effects and long-term health implications, prioritizing products with minimal to no adverse effects.

Real user experiences provided invaluable insights. We sifted through thousands of reviews and testimonials, looking for patterns of success, satisfaction, and any reported product issues. The credibility of the brand behind a supplement is telling. Convenience in usage plays a significant role in adherence to any supplement regimen.

We looked at the dosage requirements, ease of swallowing the pills, and the practicality of incorporating them into daily routines.

Finally, the cost-effectiveness and satisfaction guarantees offered by the brands were crucial. Weight loss pills typically feature a blend of natural and plant-based ingredients, each selected for its potential to enhance metabolism or increase caloric burn, thereby aiding in fat loss.

While many of these supplements might not be clinically tested or FDA-approved, the science behind their constituent ingredients often has a substantial foundation. These ingredients, from herbal extracts to vitamins and minerals, are chosen based on their historical use and emerging scientific research.

Capsimax Powder, a concentrated form of capsaicinoids derived from red chili peppers, plays a significant role in weight loss supplements.

The science behind its effectiveness is rooted in thermogenesis — the process of heat production in organisms.

Capsaicinoids boost thermogenesis, thereby increasing energy expenditure and promoting fat oxidation. Additionally, Capsimax Powder has been shown to have appetite-suppressing properties, reducing overall caloric intake. Its ability to target metabolism and appetite makes it a sought-after ingredient in weight management.

See PhenGold Reviews. PhenGold contains no synthetic materials; all ingredients are natural. It has several effects; it helps promote weight loss, encourages fat burning , and speeds up the metabolism. There are no proprietary ingredients, so you can understand what each ingredient does.

It contains a fair amount of caffeine, but not as large a dose as some of the others. PhenGold is soy-free, gluten-free, dairy-free, vegan, and non-GMO.

See PrimeShed Reviews. PrimeShred advertises three significant effects: increasing fat-burning thermogenesis , [1] speeding up metabolism, and maintaining energy and focus. It contains high-quality natural ingredients, and every ingredient is transparently listed on the label.

See Phen24 Reviews. This twenty-four-hour system includes two different pills, one for the morning and one for the evening. The daytime pill, for example, increases metabolism and energy while decreasing appetite, while the nighttime pill decreases food cravings and cortisol levels to help with weight management and better sleep.

The ingredients are clean and transparent and include vitamins and minerals to enhance your overall health in addition to the weight loss features. See TrimTone Reviews. TrimTone is the simplest pill on this list. It works through appetite suppression, fat burning, and increasing energy and focus.

However, it has a large amount of caffeine and other stimulants, which women can be more sensitive to than men.

Since every person reacts differently to various compounds, the best way to choose pills is to try them and see what works.

Green tea extract [2] boosts thermogenesis, especially when combined with exercise and other parts of a healthy lifestyle. In addition, it improves glucose tolerance [3] and helps oxidize fat. Studies have shown that caffeine can help you lose weight , [4] but mostly when accompanied by a healthy diet and exercise.

It aids in speeding up your metabolism, making exercise more effective. This is a difficult-to-pronounce ingredient derived from plants that have been cultivated for medicine in China for a long time. There are prescription weight loss drugs , [5] which are often more effective than the over-the-counter version if your physician agrees you should use them.

The alternative natural weight loss pills can be better if you want organic compounds and try to avoid synthesized chemicals as in prescription medications. Whether you choose prescription weight loss drugs or not is up to you and your preference. Always take the recommended dose. This is a difficult question to answer since it varies depending on the brand and the ingredients.

There are a lot of different dietary supplements to help you lose weight on the market, but we hope this guide helps you select the best options for yourself and your lifestyle! All three are alternatives to the brand Phentermine, a prescription weight loss medication.

You should definitely not do that! These pills are designed to work alone, and most of them use the same ingredients so that you could get much too high a dose. Keep an eye out for adverse effects. Stop taking the supplements or find a different brand if you need to.

EHproject has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. We work mostly with peer-reviewed studies to ensure accurate information.

We avoid using tertiary references. You can learn more about how we ensure our content is accurate and current by reading our editorial policy. Christine is a certified personal trainer and nutritionist with an undergraduate degree from Missouri State University. Her passion is helping others learn how strong and healthy they can become by transforming their daily habits.

Christine spends… See More. Expert's opinion We believe information about products and services that could benefit people should be made available to consumers to help them make informed decisions about their health care. Check Price See PhenQ Reviews. Vegan Good money-back guarantee Few side effects No synthetic additives Free shipping globally Not suitable for children or pregnant or nursing mothers Has a large amount of caffeine.

Check Price See LeanBean Reviews. Formulated for women Caffeine-free Vegan, gluten-free, soy-free, non-GMO, and organic Testing results are available online day money-back guarantee Complicated return policy Six pills each day Results can be delayed and may vary. Instant Knockout. Check Price See Instant Knockout Reviews.

Check Price See PhenGold Reviews. Good money-back guarantee FDA registered facility Fast and reliable shipping No proprietary, secret ingredients High concentration of caffeine Can be expensive The availability is limited to certain countries.

Check Price See PrimeShed Reviews. Lose excess weight without losing muscle Backed by clinical research Naturally grown, soy-free, gluten-free, non-GMO, and vegan Sometimes causes upset stomachs Can be expensive Not safe for pregnant or breastfeeding women.

Check Price See Phen24 Reviews. Check Price See TrimTone Reviews. Made for women Suppresses the appetite Only one pill a day Not vegan Not safe for pregnant or breastfeeding women High levels of stimulants such as caffeine.

Frequently Asked Questions FAQs. Are PhenQ, PhenGold, and Phen24 related? Can you take more than one weight loss supplement?