Scientists warn a popular vitamin D supplement may have a hidden downside

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New research suggests vitamin D2 supplementation can reduce the body’s levels of vitamin D3, which is more effective at raising overall vitamin D levels. The report also notes earlier research associating D3 with stronger immune protection against viruses and bacteria.

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.