Intravenous Vitamin C Therapy with various other antioxidants and nutrients has been used for years as a treatment option for various types of cancer. The very high doses of Intravenous Vitamin C (15 to 100 grams/infusion) appear to be toxic (lethal) to cancer cells. It is used to stabilize membranes, boost the immune system, and increase energy. It also has anti-viral, anti-bacterial and anti-histamine properties. High doses of vitamin C given intravenously have very few side effects. Intravenous Vitamin C Therapy is not a cure for cancer but a viable treatment option.