Vitamin C supplements cut effectiveness of cancer drugs, say scientists - Daily Mail 1st September 2008

Vitamin C supplements could cut the effectiveness of cancer drugs, researchers warn. U.S. scientists found that cancer cells treated with vitamin C in the laboratory resisted drug treatment by up to 70 per cent. Tumours also grew more rapidly, tests on mice found.

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Vitamin 'may blunt cancer drugs' - BBC Health News 30th September 2008