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Supplement Labels Can’t Be Trusted When It Comes To Listing Actual Amounts Of Vitamin D

February 11, 2013: 12:00 AM EST
A comparison of vitamin D potencies among a variety of over-the-counter supplements has found that amounts listed on labels often do not match the actual contents. U.S. researchers who used an independent lab to analyze supplement contents said the amount of vitamin D ranged from nine percent to 146 percent of the amounts listed on the labels. The researchers said their biggest worry is that someone who has low levels of vitamin D in their blood and regularly takes a supplement with little vitamin D in it “could face health risks”. Americans spend $28 billion on vitamins, herbs, and supplements each year, according to the New England Journal of Medicine.
Erin S. LeBlanc et al. , "Over-the-Counter and Compounded Vitamin D: Is Potency What We Expect? ", JAMA Internal Medicine, February 11, 2013, © American Medical Association
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