Scientists have found that high intravenous doses of vitamin C kills cancer cells. The ascorbate dose has to be very high, too high to be taken orally, hence the intravenous administration.
The tests were carried out in a lab, simulating clinical infusions of vitamin C on 9 different cancer cells and 4 normal cells. They found that while the normal cells were not affected, 5 of the cancer cells became 50% smaller. The lymphoma cells were completely destroyed.
Intravenous administration allows the patient to have even higher quantities in his/her bloodstream.
When asked why the cancer cells were dying, the researchers suggested it may have been due to the formation of hydrogen peroxide. Hydrogen peroxide kills cancer cells. However, they said they were not sure.