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Benefits of D-Aspartic Acid

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Evidence-Based Benefits

  • Testosterone elevation — a 2009 study found 3.12 g/day DAA for 12 days increased testosterone by 42% and LH by 33% in healthy sedentary men (Topo et al., Reproductive Biology and Endocrinology, n=23)
  • Sperm quality — DAA supplementation improved sperm concentration and motility in subfertile men in a 2012 study (D'Aniello et al., Advances in Sexual Medicine)
  • LH stimulation — DAA acts on the hypothalamus and anterior pituitary to stimulate gonadotropin-releasing hormone (GnRH) and LH secretion
  • No effect in trained men — a 2013 RCT found 3 g/day DAA for 28 days did not increase testosterone in resistance-trained men (Willoughby & Leutholtz, Nutrition Research)
  • Neuroendocrine signaling — DAA is found in high concentrations in the pineal gland, hypothalamus, and testes, suggesting broad neuroendocrine roles

What the Research Says

D-Aspartic Acid generated excitement with the 2009 Topo et al. study showing 42% testosterone increases. However, subsequent research in resistance-trained men (Willoughby & Leutholtz 2013; Melville et al. 2015) showed no significant testosterone elevation, suggesting the initial findings may not apply to young, active men with already-optimal testosterone. DAA may be more useful for subfertile men or those with suboptimal testosterone due to age or lifestyle factors.

Related Conditions

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Full D-Aspartic Acid Guide

References

  1. (). The role and molecular mechanism of D-aspartic acid in the release and synthesis of LH and testosterone in humans and rats. Reproductive Biology and Endocrinology. DOI
  2. (). D-aspartic acid supplementation combined with 28 days of heavy resistance training has no effect on body composition, muscle strength, and serum hormones. Nutrition Research. DOI
  3. (). Three and six grams supplementation of d-aspartic acid in resistance trained men. Journal of the International Society of Sports Nutrition. DOI