Vitamin D Supplement Potency Often Not What Label Says
By Christian Nordqvist on February 13, 2013
When you buy your vitamin D supplements over-the-counter be careful, they may be less potent than the labels claim, researchers from Kaiser Permanente reported in JAMA Internal Medicine.
vitamin D supplements can have as little as 9% and as much as 146% of what their labels claim
“We were surprised by the variation in potency among these vitamin D pills. The biggest worry is for someone who has low levels of vitamin D in their blood. If they are consistently taking a supplement with little vitamin D in it, they could face health risks.”