Story perspectives
Vitamin D2 May Lower D3 Levels, Experts Warn
10/8/2025
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Story summary
- New research shows vitamin D2 supplementation may lower vitamin D3 levels, challenging interchangeability.
- A meta-analysis finds D2 users lose 9 to 18 nmol/L of D3 versus controls.
- Experts recommend vitamin D3 as the more effective option for maintaining vitamin D levels and health.
- Limited sun exposure and dietary sources contribute to deficiency, especially in winter; seek tailored professional guidance.
