Harvard Men's Health Watch

On call: Vitamin D2 or D3?

Q. After reading your article on multivitamins, I've decided to switch from my old multivitamin to plain vitamin D. But I'm confused by the various types of vitamin D. Which kind should I take?

A. You are wise to take vitamin D, but even wise men are likely to be confused by the complexities of vitamin D.

Vitamin D is essential for health. Its most well-established role is to increase the intestinal absorption of calcium, keeping bones strong. But important research also raises the hope that vitamin D may help protect against prostate cancer and other malignancies, muscular weakness and falling, heart disease, and other disorders.

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