The Full Nitty Gritty
Some research has shown that intravenous vitamin C has a greater effect on immune enhancement than oral administration. Oral doses of vitamin C can achieve blood concentration levels of 220 micromoles per liter, which serves as an anti-oxidant and protects healthy cells against bacteria and viruses.
On the other hand, intravenously administered vitamin C can achieve up to 1,000 micromoles per liter of blood concentration levels, thus producing hydrogen peroxide, which is known to be toxic to cancer cells. Experiments have shown that in high concentrations, vitamin C serves as a pro-oxidant, which causes cancer cell death without causing any toxic side effects to the body, in contrast to chemotherapy and radiation therapy.