Verdict
Not enough evidence
Vitamin D3 raises blood vitamin D levels higher and longer than vitamin D2.
No counted mention yet.
By Arun AgrahriLast reviewed
Short answer
Yes. D3 (cholecalciferol) is the form your skin makes from sunlight, and it raises blood levels higher than D2 (ergocalciferol) and holds them longer. Mark Hyman goes further: always pair D3 with K2.
Vitamin D supplements are worth taking.
The verdict on Vitamin D overall. 12 sources: 6 positive, 6 partly
positive partly neutral negative Each researcher and each study counts once per claim, however often they come up.
Vitamin D3 raises blood vitamin D levels higher and longer than vitamin D2.
No counted mention yet.
Researchers say
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Studies show
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Vitamin D3 raises blood vitamin D levels higher and longer than vitamin D2. D3 is cholecalciferol, the same form your skin makes from UVB sunlight, and it has a longer half-life than D2 (ergocalciferol).
Peter Attia is direct: "When I say vitamin D, I mean D3." Mark Hyman warns that fortified foods often use the cheaper D2 form, and he pairs D3 with K2 every time, for calcium metabolism. Rhonda Patrick's work on D3 shows a 40% lower dementia risk, and she ties deficiency to 5 years of faster aging.
Vegan D3 from lichen is now easy to find if you want a plant source.
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Full Vitamin D evidence report
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