D-Aspartic Acid — answers to D-AA
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The D-isomer form of the amino acid aspartic acid. It occurs naturally in the body in small amounts, including in tissues involved in hormone regulation, and is sold as a standalone supplement mainly in sports and men's-health products.
Why it’s used
Taken by some to support testosterone levels, particularly in men's fitness and fertility-adjacent products.
What the evidence is for
testosterone levels, inconsistently, mainly in men with low baseline levels.
What the evidence says
Some small trials in men with low baseline testosterone or fertility issues have reported increases in testosterone with D-aspartic acid supplementation, but subsequent studies in healthy, resistance-trained men found no significant effect on testosterone or strength outcomes. The overall evidence is inconsistent and does not support a reliable effect in the general population of supplement users.
Dose studied
2.6–3 g — daily doses used in trials examining testosterone effects.
Context
Trials showing a positive signal used populations with lower baseline testosterone or fertility concerns, over periods of about 90 days, at doses commonly around 2.6 to 3 grams per day; trials in healthy trained men used similar dose ranges and found no benefit.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.