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Will ZMA increase my testosterone levels and help me sleep?

Q. I have a question about the supplement ZMA. Have you used it, and do you think it is effective for increasing testosterone levels in trained adults? I realize there is a bit of controversy surrounding the study done by the inventor of the formula, so I wanted to get your opinion. Even more important (to me) is the question of whether or not it functions as a sleep aid. Is there any reason to suspect that the claims that ZMA promote a more restful sleep are accurate? Have any studies been done to track that?

A. ZMA is short for zinc and magnesium aspartate (the supplement also contains vitamin B6). Each serving contains 30 milligrams of zinc monomethionine aspartate, 450 milligrams of magnesium and 10.5 milligrams of vitamin B6. The B6 is included because it's supposed to enhance the...

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