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That distinction matters because vitamin D2 and vitamin D3 are often treated as interchangeable sources of the same nutrient. Both can increase overall vitamin D status, but a growing body of evidence indicates that D3 is generally more effective at raising and maintaining the main form of vitamin D measured in the blood. Current guidance from the U.S. National Institutes of Health reflects that evidence, noting that D3 tends to raise vitamin D levels more and keep them elevated for longer than D2.

That distinction matters because vitamin D2 and vitamin D3 are often treated as interchangeable sources of the same nutrient. Both can increase overall vitamin D status, but a growing body of evidence indicates that D3 is generally more effective at raising and maintaining the main form of vitamin D measured in the blood. Current guidance from the U.S. National Institutes of Health reflects that evidence, noting that D3 tends to raise vitamin D levels more and keep them elevated for longer than D2.