Ecological Formulas Vitamin C-1000 (from Tapioca) is a dietary supplement for immune support. Vitamin C is one of the most powerful supporters of the immune system available. The body is unable to produce vitamin C so it must be obtained from diet or supplementation. Adequate levels of vitamin C support the healthy function of the immune system as well as supporting proper cardiovascular system function. This is a highly purified source of ascorbic acid that is comparable to reagent grade vitamin C. It is hypoallergenic and designed for individuals with extreme food sensitivities who are unable to tolerate less pure forms of ascorbic acid. Recommended usage: Take one to three capsules daily or as directed by a physician.