Scientists warn popular vitamin D supplement may have a “previously unknown” downside
Recent research indicates that vitamin D2 supplements may unintentionally lower the body's levels of vitamin D3, which is considered the more effective form of vitamin D. This finding has led scientists to reconsider the preferred choice for supplementation, suggesting that vitamin D3 may be more beneficial for individuals. The study highlights the importance of ensuring access to plant-based vitamin D3 in the UK, especially during winter months when sunlight exposure is limited.
- ▪Vitamin D2 supplements can decrease the body's concentration of vitamin D3.
- ▪Vitamin D3 is more effective in boosting overall vitamin D levels and supporting the immune system.
- ▪The study suggests that vitamin D3 should be prioritized over vitamin D2 for supplementation.
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| Original publisher | ScienceDaily |
| Canonical URL | https://www.sciencedaily.com/releases/2026/05/260523021820.htm |
| Publication time | Sat, 23 May 2026 10:38:26 EDT |
| Retrieval time | 2026-05-23T14:42:27.162Z |
| Last seen | 2026-05-23T14:42:27.162Z |
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Science News from research organizations Scientists warn popular vitamin D supplement may have a “previously unknown” downside Date: May 23, 2026 Source: University of Surrey Summary: 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 system fight off viruses and bacteria. The discovery is prompting scientists to rethink whether D3 should become the preferred choice for supplementation. Share: Facebook Twitter Pinterest LinkedIN Email FULL STORY Recent research suggests some vitamin D supplements might be working against your body’s most effective form of vitamin D.
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