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D-Aspartic Acid

Amino acid involved in testosterone synthesis signalling; evidence is mixed & may only benefit those with below-normal T.

hormonesstrengthmens health

Evidence last reviewed: 04 Apr 2026

Evidence
1 record
1 recordBest grade:Low
Biomarkers
Testosterone

Research shows mixed results, particularly in men with sub-normal testosterone levels. Some studies indicate a potential 30–40% increase, but trained athletes often see no benefit or a decline.

Testosterone levels
Men with sub-normal T; sedentary men · RCTs (conflicting)
Low

Some studies show ~30–40% T increase in low-normal men; trained athletes show no benefit or even slight decline.

Dose: 3000 mgDuration: 2–4 weeks
Effect likely limited to those with low baseline T; not effective in well-trained men.
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hormonalmens-healthstrength

Combining D-Aspartic Acid with Boron can support hormonal balance and testosterone levels in men. D-Aspartic Acid is known to boost testosterone production, while Boron enhances the bioavailability of testosterone.

D-Aspartic Acid
3000mg
Boron
6mg
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Forms & usage
How to take it

Take 3 grams daily, preferably in the morning.

D-Aspartic Acid powder / capsule
Short-term cycling more promising than continuous.
Safety & trade-offs3
Hormones

Testosterone benefit attenuates after ~2 weeks of continuous use in many individuals

Note

May worsen acne in testosterone-sensitive individuals

Note

No benefit in well-trained men with normal testosterone — effect limited to those with sub-optimal baseline T

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