Research: Vitamin D doses often don't match labels, study says

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What's in your vitamin supplement? It could be more or less than you think, according to the latest study to show that what's on a supplement label is not necessarily what's in the bottle.

Researchers who tested vitamin D pills sold in stores found they contained from 9% to 140% of the doses listed on labels, according to a research letter published Monday in JAMA Internal Medicine. Though none of the pills was likely to be dangerous, some contained too little of the vitamin to effectively treat someone with a deficiency, the researchers say.

"We found the potency of these vitamin D supplements varied widely," says Erin LeBlanc, an endocrinologist who led the study at the Kaiser Permanente Center for Health Research in Portland, Ore. Other studies have found similar variations in other supplements. For example, more than one-third of multivitamins tested by ConsumerLab.com in 2009 were contaminated or contained significantly more or less of some ingredients than their labels claimed. The company also recently tested vitamin D samples and found some mislabeling ...Read More 

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