10/9/2026
Vital Signs · nutrition
Scientists warn a popular vitamin D supplement may have a hidden downside
Filed by Dr. Iris Vale
Not all vitamin D supplements are created equal, and new research suggests that one popular form may have an unexpected downside. Scientists found that taking vitamin D2 can actually lower the body's levels of vitamin D3, the form naturally produced by sunlight and more effective at boosting overall vitamin D. Previous studies also suggest that vitamin D3 may provide stronger immune protection against viruses and bacteria.
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Dr. Iris Vale
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