Educational dose math only — not medical advice, not a product recommendation, and not a pass/fail on whether a supplement will work for you.
0 100% 150%+

—

Enter label dose

Trial reference

From your label

Per-day total — not per serving unless you take one serving

Enter your label dose — the gauge updates instantly.

Placebo-controlled, 45 women on SSRIs or SNRIs randomised. Remission favoured maca but stayed low in absolute terms — 9.5% vs 4.8% by ASEX and 30% vs 20% by MGH-SFQ — and the benefit clustered in postmenopausal women. Women only; there is no male equivalent of this trial.

Educational only — not medical advice. Disclaimer.

NIH DSLD market slice

Median0.3 g
Products1,239
Below94%

Bulk CSV dump 16 January 2026 · label entries through 2025. Disclosed amounts only — proprietary blends without gram weights excluded.

Trial floors

Primary

Antidepressant-induced sexual dysfunction, women · 3 g over 12 weeks (limited evidence) · Benefit shown — Placebo-controlled, 45 women on SSRIs or SNRIs randomised. Remission favoured maca but stayed low in absolute terms — 9.5% vs 4.8% by ASEX and 30% vs 20% by MGH-SFQ — and the benefit clustered in postmenopausal women. Women only; there is no male equivalent of this trial.

Other floors

  • Dose-finding pilot, 1.5 g arm failed · 1.5–3 g (limited evidence) · Primary endpoint missed — Head-to-head 1.5 g/day vs 3.0 g/day in 20 remitted depressed outpatients, 17 of them women. Only the 3.0 g arm improved significantly on ASEX and MGH-SFQ; 1.5 g/day did not separate. Ten completers. This is the entry's evidence that the lower dose is below the floor, not above it.

  • Men with mild ED, subjective wellbeing · 2.4 g over 12 weeks (limited evidence) · Secondary outcomes only — The only randomised maca trial in men, and it was mild general ED rather than antidepressant-induced. Both arms improved; maca improved more, but IIEF-5 gained only 1.6 points vs 0.5 on placebo — far below the roughly 4-point threshold for a change men notice. The paper frames its own outcome as subjective wellbeing.

Label reading notes

  • Report outcomes by sex, never pooled. The 3 g/day evidence is in women on antidepressants; the men's evidence is a different dose, a different condition, and a subjective endpoint.
  • Trials used gelatinised maca root powder. Extracts, "maca blends" and black/red/yellow varietal claims are not interchangeable at the same gram count.
  • Maca did not change testosterone or oestrogen in healthy men — it is not a hormonal supplement.
  • 3 g/day is a powder-scale dose; capsule products often need six or more servings to reach it.