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Recently a friend told me about D-Aspartic Acid. Since I was disillusioned about ZMA, I would like to get some knowledge, before I try it out. Are there any scientific studies, that prove it really works? Especially studies not conducted by companies, that sell products containing DAA.

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A study on the National Institute of Health (NIH) website found an increase in LH and testosterone in both rats and humans.

Some caveats though... This doesn't prove that it will be beneficial as a muscle building aid or supplement. Also, I've seen at least one reference that claimed it also causes the replacement of testosterone with estrogen so that it's not fully effective. I don't have that one handy, so I can't speak to the validity of that claim.

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A study on the National Institute of Health (NIH) website has shown that it doesn't have any increase in testosterone for active and/or young men

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