Vitamin C supplements may significantly reduce the effectiveness of several anti-cancer drugs by protecting the mitochondria, according to a new study published Wednesday.

A team of New York researchers gave large doses of vitamin C, equivalent of a 2,000-milligram, to mice with tumors prior to chemotherapy. The researchers found that the vitamin C reduced the effectiveness of the chemotherapy by about 30 percent to 70 percent

A high intake of vitamin C may help reduce bone loss in elderly men, according to a new study. However, the same is not true for women of the same age group.

Lead researchers Katherine L. Tucker, a senior scientist at the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University and her team evaluated the bone density of 213 men and 393 women, average age 75 at the start, over a four-year period to see what association their vitamin C intake had with their bones

Intravenously delivered vitamin C helps lowering high blood pressure by calming an overactive central nervous system, new Italian research suggests.

Lead author Dr. Rosa Maria Bruno from the University of Pisa treated 12 patients with high doses of vitamin C given intravenously. None of the patients had received any kind of prior treatment for their condition. Over a five-minute period, all the patients were intravenously administered three grams of vitamin C

A high intravenous dose of vitamin C could one day reduce the size of cancerous tumors in people, new studies say. When tested on mice, intravenous vitamin C produced hydrogen peroxide, which proceeded to reduce cancerous tumors in the mice by 43 percent to 51 percent.

The mice had ovarian, pancreatic and brain cancer. The normal cells remained unharmed by the therapy

Low vitamin D levels is linked with cardiac risks, a new study has found adding to the pre-existing evidence about the "sunshine" vitamin's role in good health.

The study, published in the June 23, 2008 issue of the Archives of Internal Medicine, found that patients with the lowest blood levels of vitamin D were about two times more likely to die from any cause during the next eight years than those with the highest levels. The link with cardio-related deaths was particularly strong in those with low vitamin D levels