Aspartic Acid
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Aspartic acid is a non-essential amino acid the body makes on its own and also obtains from protein-containing foods; it participates in cellular energy pathways and neurotransmitter synthesis.
Why it’s used
Included in some formulas, particularly as its D-isomer form, on claims of supporting testosterone levels or athletic performance; the plain L-form is more often present simply as a building-block amino acid.
What the evidence says
Evidence for D-aspartic acid raising testosterone or improving performance comes from a handful of small studies with mixed and inconsistent results; plain L-aspartic acid has not been studied for these claims at all.
Context
The small trials that exist on D-aspartic acid used it over a few weeks in specific populations such as resistance-trained men, and results have not been consistently replicated.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.