Sunday, June 22, 2008

Just how safe is vitamin supplementation?

Megadoses of E, for example, can increase the risk of bleeding if you’re already on heart meds like blood thinners. An earlier 2004 analysis by Johns Hopkins researchers found consuming 400 IU or more of vitamin E a day alone (some products on the market today contain 1,000 IU per capsule) was associated with a higher risk of dying and should be avoided. (One theory says high doses may alter your natural immune function and actually become pro-oxidant.) Taking too much niacin without a doctor’s okay can lead to liver damage and other problems over time. And too much vitamin A increases the risk of liver and lung cancers, and can cause birth defects and reduce bone density.

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