Tribulus terrestris

Tier 3 — weak evidence · Testosterone · Libido · Athletic

Despite widespread marketing as a testosterone booster, the evidence does not support this claim. A 2024 review of 12 trials found no significant effect on testosterone in healthy men. Some people report improved libido subjectively, but this may be placebo. European food safety authorities rejected all testosterone-related health claims.

Dose: 250–750 mg/day standardised extract (40–45% saponins); no testosterone effect demonstrated