We use essential cookies (authentication, your saved goals/stack) by default. With your permission we’ll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies

Daa3.0

D-Aspartic Acid Research

Mostly mechanism / observational

8 peer-reviewed studies

What the evidence says

Mostly mechanism / observational

Most D-Aspartic Acid studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.

Most evidence is from high-quality meta-analyses and randomised trials published 2013–2025.

Based on 8 studies · 1 meta-analysis · 6 RCTs

Confidence

Moderate confidence

By outcome

Men's vitalityNo testosterone benefit in resistance-trained men (higher doses may lower it) · 2-12 weeks
Mostly mechanism / observational4 studies
Muscle strength & powerNo performance or muscle benefit shown with training · Variable
Too few graded studies1 study

Active research area

3 studies in the last 5 years · Latest meta-analysis: 2018

201320192025

1Meta-Analysis2018

Wang H, Zhang X, Wu W, Zhang M, Sam NB, Niu L · Medicine (Baltimore) (2018)

View source

2RCT2019

Crewther B, Witek K, Draga P, Zmijewski P, Obmiński Z · Int J Sport Nutr Exerc Metab (2019)

View source

3RCT2023

Płoszczyca K, Czuba M, Zakrzeska A, Gajda R · Nutrients (2023)

View source

4RCT2013

Willoughby DS, Leutholtz B · Nutr Res (2013)

View source

5RCT2017

Melville GW, Siegler JC, Marshall PWM · PLoS One (2017)

View source

6RCT2025

In plain English: A 2025 randomized trial of a D-aspartic acid + ubiquinol + zinc combination in infertile men found increased total testosterone and sperm motility — but the effect cannot be isolated to DAA.

GamalEl Din SF et al. · Arch Ital Urol Androl (2025)

A DAA + ubiquinol + zinc COMBINATION raised total testosterone (p=0.009) and sperm motility in infertile men
Combination product — the effect cannot be attributed to D-aspartic acid alone
Different population (infertile men), not the null resistance-trained trials

View source

7RCT2015

In plain English: A trial of 3g and 6g D-aspartic acid in resistance-trained men found no benefit — and the higher dose tended to LOWER testosterone.

Melville GW et al. · J Int Soc Sports Nutr (2015)

No benefit at 3g; 6g tended to DECREASE testosterone
Higher doses may be counterproductive
Resistance-trained men

View source

8Systematic Review2024

In plain English: A systematic review of 'testosterone boosters' found D-aspartic acid did not reliably increase serum total testosterone.

Morgado, Tsampoukas, Sokolakis, Schoentgen, Urkmez, Sarikaya · International journal of impotence research (2024)

Systematic review evaluating testosterone-booster supplements including D-aspartic acid
Most boosters, D-aspartic acid among them, did not reliably raise serum total testosterone
Key counter-evidence against the testosterone-boosting claim

View source

View in Research Library

D-Aspartic Acid Research

Mostly mechanism / observational

Association between the aspartic acid D-repeat polymorphisms and osteoarthritis susceptibility: An updated systematic review and meta-analyses.

Short-Term d-Aspartic Acid Supplementation Does Not Affect Serum Biomarkers Associated With the Hypothalamic-Pituitary-Gonadal Axis in Male Climbers.

The Effects of Six-Gram D-Aspartic Acid Supplementation on the Testosterone, Cortisol, and Hematological Responses of Male Boxers Subjected to 11 Days of Nocturnal Exposure to Normobaric Hypoxia.

D-aspartic acid supplementation combined with 28 days of heavy resistance training has no effect on body composition, muscle strength, and serum hormones associated with the hypothalamo-pituitary-gonadal axis in resistance-trained men.

The effects of d-aspartic acid supplementation in resistance-trained men over a three month training period: A randomised controlled trial.

Evaluation of in vivo supplementation of 2660 mg D-aspartic acid and 200 mg ubiquinol and 10 mg zinc on different semen parameters in idiopathic male infertility: a randomized double blind placebo controlled study.

Three and six grams supplementation of d-aspartic acid in resistance trained men.

Do "testosterone boosters" really increase serum total testosterone? A systematic review.