What are the health benefits and risks of d-aspartic acid?

D-Aspartic acid is one of the two forms of the amino acid called Aspartic acid (a non-essential amino acid and one of the two components of aspartame, an artificial sweetener). The naturally occurring form of Aspartic acid is L-Aspartic acid.  It is mainly sold as a testosterone booster, although there is inconclusive research to support that it actually can increase testosterone.  Possible side effects may include an increase in estrogen (if it actually does increase testosterone).

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