Popular Supplement May Have Unexpected Effect
A common vitamin D supplement, vitamin D2, might have an unintended consequence: lowering the body’s levels of vitamin D3. Research published in October 2026 by scientists at the University of Surrey found that taking vitamin D2 can reduce amounts of vitamin D3, which is naturally produced through sunlight exposure.
D2 vs. D3: What's the Difference?
While both vitamin D2 and D3 can increase overall vitamin D status, evidence suggests that vitamin D3 is more effective at raising and maintaining levels of this crucial nutrient in the blood. The U.S. National Institutes of Health acknowledges these findings, stating that vitamin D3 tends to elevate vitamin D levels for a longer duration than vitamin D2.
Why Vitamin D Matters
Vitamin D is essential for calcium absorption and maintaining strong bones. It also plays an important role in muscle function, nerve health, and immune support. The research highlights that not all vitamin D supplements are equal, and consumers should be aware of these potential differences.
Multivitamins & Supplements
Experts note the importance of filling nutritional gaps with multivitamins when diet falls short. Recent testing by lab experts evaluated multiple vitamins and supplements for quality, ease of use, and cost in October 2026. Other popular supplement options include magnesium and NMN.
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