Vitamin C

Common colds: Can vitamin C prevent or relieve them?

Taking vitamin C every day to try to prevent colds does not protect most people from colds. It only slightly shortens the amount of time that they are ill. Starting to take vitamin C at the first sign of a cold does not affect the course of the cold. more...

Prevention: Do some vitamins and dietary supplements do more harm than good?

Antioxidant supplements generally do not help prevent cancer and other life-threatening conditions. Too high doses of the antioxidants vitamin A, beta-carotene and vitamin E may even increase the risk of dying sooner. more...