Study: Vitamin D2 Is Much Less Effective than Vitamin D3

A study published by the Journal of Clinical Endocrinology & Metabolism found that Vitamin D2 is much less effective than Vitamin D3 in humans.

“Vitamin D2 potency is less than one third that of vitamin D3. Physicians resorting to use of vitamin D2 should be aware of its markedly lower potency and shorter duration of action relative to vitamin D3.”

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