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What is it? Overview Usage Side Effects and Warnings

Antioxidants Side Effects and Warnings

Written by ColleenO.

In a 2008 detailed review of 67 randomized trials involving 232,550 participants, researchers found no evidence that antioxidant supplements could reduce mortality in either healthy or diseased individuals. On the contrary, there was some evidence that vitamin A , beta-carotene, and vitamin E supplementation may actually increase mortality.7

It is highly unlikely that antioxidants are harmful in modest quantities, such as those recommended by the U.S. government (called upper intake levels, or ULs). Foods that are naturally rich in antioxidants are considered not only safe, but beneficial. For more information, see side effects and warning information for the antioxidants that may help treat allergic rhinitis:

Vitamin C side effects and warnings

Vitamin E side effects and warnings

Quercetin side effects and warnings

Beta-carotene side effects and warnings

Zinc side effects and warnings

Selenium side effects and warnings



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