Also known as: DAA, D-Aspartate, Sodium D-Aspartate
D-Aspartic acid (DAA) is an amino acid enantiomer that plays a role in neuroendocrine signaling. It is primarily researched for its potential to transiently increase testosterone and luteinizing hormone levels in men.
D-Aspartic acid is the D-enantiomer of the common amino acid aspartic acid. Unlike the L-form found in proteins, DAA accumulates in neuroendocrine tissues including the hypothalamus, pituitary gland, and testes, where it stimulates the release of gonadotropin-releasing hormone (GnRH), luteinizing hormone (LH), and subsequently testosterone. Initial human studies showed a transient increase in serum testosterone of approximately 30–40% over 12 days, though longer-term studies in resistance-trained men have been less conclusive. DAA may be most useful for men with suboptimal testosterone levels rather than eugonadal individuals. It is available as free acid or as sodium D-aspartate salt.
In men with below-average testosterone, DAA supplementation for 12 days increased serum testosterone by approximately 30–40% and LH by 33% in a key clinical study.
In subfertile men, DAA supplementation improved sperm concentration and motility alongside increased testosterone in a 90-day trial.
In the morning with or without food
Cycling (e.g., 2–3 weeks on, 1–2 weeks off) is commonly recommended due to potential desensitization.
Flexible dosing and cost efficiency
Convenience and taste neutrality
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