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Vitamin D Supplements: Is What You See What You Get?
Date:2/11/2013

By Denise Mann
HealthDay Reporter

MONDAY, Feb. 11 (HealthDay News) -- Many vitamin D supplements may not contain what their label says they do, a new study warns.

Some pills may pack a lot more vitamin D than the label states, and others may provide markedly less, according to the findings, published in a research letter Feb. 11 in JAMA Internal Medicine.

The researchers are more concerned by pills delivering too little of the vitamin than pills providing too much.

"It can be hard to overdose on vitamin D," said study author Dr. Erin LeBlanc, an endocrinologist and researcher with the Kaiser Permanente Center for Health Research in Portland, Ore. However, the findings "may be a concern for those who have been told by their doctor to take vitamin D if their chosen supplement does not have the amount listed."

Vitamin D is known as the sunshine vitamin because it is produced in response to exposure to natural sunlight. This nutrient is also added to milk and other foods, and is available in small amounts in fatty fish, beef liver, cheese, and egg yolks. Still, it can be challenging to get as much D as needed through diet, so supplements are often recommended. Some researchers have linked vitamin D deficiency to the bone disease osteoporosis, heart disease and some types of cancer.

Exactly how much vitamin D people need has been somewhat controversial in recent years. The independent, not-for-profit Institute of Medicine recommends 600 international units (IU) a day for teens and adults, or 800 IU for those older than 70. Some groups feel that this bar was set too low.

In the new study, researchers analyzed 55 over-the-counter bottles of vitamin D supplements from 12 manufacturers. They also tested vitamin D pills made at a compounding pharmacy, which creates individualized drugs. The manufacturers were unidentified.

Overall, the amount of vitamin D found in the supplements ranged f
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