Maca Root
Lepidium meyenii
What the evidence shows
One of the few supplements with trial evidence for improving libido specifically, independent of any hormonal change — several RCTs show increased sexual desire without corresponding shifts in testosterone, suggesting a non-hormonal mechanism. Not a testosterone booster despite frequent marketing claims to the contrary.
How it's thought to work
Unclear — does not appear to act through the HPG axis. Proposed central nervous system and dopaminergic pathway effects on sexual desire.
Typical Dosage
1.5–3g/day of dried root powder or standardized extract.
Safety Notes
Very well-tolerated, food-derived. No significant hormonal safety concerns given the non-hormonal mechanism.
Want the full clinical breakdown?
Maca (Lepidium meyenii) improves libido in multiple RCTs — but without changing testosterone. Its mechanism involves unique glucosinolates acting directly on hypothalamic arousal pathways.
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