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Vitamin C, or ascorbic acid, is a water-soluble vitamin. Unlike most mammals, humans do not have the ability to make their own vitamin c and must obtain it from supplementation or diet. Vitamin C is essential for multiple reactions in the body such as collagen production, immune system activation, metabolism support and acts as a potent antioxidant. Studies indicate that higher blood levels of vitamin C are associated with lower risk of death from cancer and cardiovascular disease. There is no scientific evidence that large amounts of vitamin C exert any adverse or toxic effects.
Cancer cells respond uniquely to intravenous vitamin C by rapidly producing hydrogen peroxide which damages the cancer cell itself through a process known as oxidative stress. Healthy cells do not respond this way to vitamin C. Thus, the intravenous administration of high doses of vitamin C can target and damage cancer cells in body.