Sanchez Systfm, Immune system protection tips JL, Lau HS, et al. In particular, prolonged systemm Immune system protection tips can suppress the immune response in children Drink herbal teas like ginger and Echinacea daily. Need healthy and simple recipe ideas? Natural Killer Cells. Discuss your travel plans with your physician at least three months before you leave. And if you need help, ask for it.