In laboratory cellular studies and studies in mice, it was found that high doses of vitamin C can enhance the anti-cancer effects of chemotherapy. In the 1970s, chemist Linus Pauling reported that intravenous administration of vitamin C could be effective in treating cancer. However, oral administration of vitamin C did not achieve the same results. It is believed that this is mainly due to the fact that if vitamin C is taken orally, the human body rapidly eliminates it from the body. Scientists at the University of Kansas in the United States say that the body absorbs the injected vitamin C and plays a role in killing tumor cells in the body, while harming normal cells. In the laboratory, researchers injected vitamin C into human ovarian cancer cells, mice, and patients with advanced ovarian cancer. Ovarian cancer cells were found to be very sensitive to vitamin C treatment, while being harmless to normal cells. In the mouse study, it was also found that standard chemotherapeutic drugs sequenced with vitamin C slowed tumor growth. Vitamin C also reduced the adverse effects of chemotherapy.