Scientists warn popular vitamin D supplement may have a “previously unknown” downside

Science Daily | Sat, 23 May 2026 10:38:26 EDT

Vitamin D2 warned,
Suppressing D3’s strong role—
Study shifts the field.

A surprising study suggests vitamin D2 supplements may reduce the body’s levels of vitamin D3 — the more effective form of vitamin D. Researchers found D3 not only boosts vitamin D status more efficiently, but may also play a unique role in helping the immune…

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