I’m a PhD & RD: I Want You To Stop Making This Vitamin D Mistake ASAP

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What I mean here is that vitamin D3 is significantly better at helping raise your total 25(OH)D levels (aka: the biomarker for vitamin D status) and keeping them there.*

Why does this ultimately matter? Well, aside from 25(OH)D being the primary indicator of whole-body vitamin D status, this compound is converted into 1,25(OH)2D (the activated form of vitamin D) for its many essential actions in cells, tissues, and organs throughout the body–like our bones, muscles, immune cells, brain, etc.*

The fact that vitamin D3 is way better than D2 at helping us achieve and maintain vitamin D sufficiency has been demonstrated by loads of robust research in humans. I’m talking about numerous randomized, placebo-controlled, and double-blind clinical trials; so many, in fact, that a landmark systematic review and meta-analysis in the American Journal of Clinical Nutrition concluded that “vitamin D3 is more efficacious at raising serum 25(OH)D concentrations than is vitamin D2.”*

How much better is vitamin D3 at increasing 25(OH)D levels? Some studies estimate that the potency of D3 is a whopping 87% higher than D2. This effect of vitamin D3 supplementation superiority has been proved over and over:* Let me share a few prime examples:

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