Story perspectives
Vitamin D2 Supplements Linked to Lower Vitamin D3 Levels
9/19/2025
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Story summary
- Research shows that vitamin D2 supplements may lower vitamin D3 levels, affecting health.
- About one in six UK adults are vitamin D deficient, particularly in winter.
- Vitamin D3, generated by sunlight, is absorbed more effectively than vitamin D2 from fortified foods.
- A meta-analysis found lower vitamin D3 levels in those taking vitamin D2.
- Limited vegan sources of D3 exist, but genetically modified tomatoes are being tested.
