Vitamin D3 vs D2

Patients of mine know that I only recommend vitamin D3 – here’s a short list of the reasons why.

Vitamin D3 is the type of vitamin D the human body produces in response to sun exposure. Vitamin D2 supplements are produced by irradiating fungus.

Research has shown that the body prefers vitamin D3 over D2 when both forms are readily available in the body (Heaney 2011).

Research has shown that vitamin D3 is more efficacious in reducing mortality risk than D2 (Bjelakovic 2011). Research has also shown than vitamin D3 is more efficacious in reducing the risk of fractures and falls than D2 (Bischoff-Ferrari 2009).


Dr. Darryl Roundy

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