Vitamin C May Blunt Effect of Chemotherapy, Study Says

WASHINGTON (Reuters) - Vitamin C supplements may undercut the effectiveness of cancer drugs including Novartis' Gleevec, a U.S. study published on Wednesday showed.

When used on human cancer cells treated with a form of vitamin C in lab dishes, chemotherapy drugs killed 30 percent to 70 percent fewer tumor cells than usual, the scientists wrote in the journal Cancer Research.

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