Educational dose math only — not medical advice, not a product recommendation, and not a pass/fail on whether a supplement will work for you.
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IIEF-5 rose from 16.4 to 21.0 against no change on placebo, and 66.6% reported improved erection. Testosterone, prolactin and cholesterol were unchanged, so this is not a hormonal mechanism. Single centre, mild to mild-moderate ED only.

Educational only — not medical advice. Disclaimer.

Want the outcome before the arithmetic? The reason check opens any registry entry on this page with its trial result first, then compares your daily intake with the studied amount.

NIH DSLD market slice

Median0.1 g
Products1,377
Below100%

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

Trial floors

Primary

1000 mg three times daily (de Andrade 2007) · 3 g over 12 weeks (limited evidence · how we grade this) · Benefit shown — IIEF-5 rose from 16.4 to 21.0 against no change on placebo, and 66.6% reported improved erection. Testosterone, prolactin and cholesterol were unchanged, so this is not a hormonal mechanism. Single centre, mild to mild-moderate ED only.

Other floors

  • 900 mg three times daily (Hong 2002) · 2.7 g over 8 weeks (limited evidence · how we grade this) · Benefit shown — Double-blind crossover with an 8-week washout design. IIEF total and RigiScan penile tip rigidity both improved; 60% reported better erections. Explicitly published as a preliminary report.

  • Cochrane pooled estimate (effect rated trivial) · 3 g (medium evidence · how we grade this) · Primary endpoint missed — Nine RCTs, 587 men. Pooled IIEF-15 erectile-function difference was 3.52 points against a minimal clinically important difference of 4, and IIEF-5 was 2.39 points — Cochrane called the effect trivial at low-to-moderate certainty. The dose is real; the benefit at that dose is small on average.

Safety red flags

  • On insulin or a sulfonylurea: tell your prescriber; watch for symptoms of low blood sugar.
  • On warfarin, a DOAC, or antiplatelets: tell your clinic, and watch for bruising or bleeding.

Label reading notes

  • Trial doses were 2.7-3 g of root per day split into three servings — many capsules hold 200-500 mg, so reaching the trial dose can mean 6-10 capsules daily.
  • Korean red ginseng means steamed Panax ginseng. American ginseng (P. quinquefolius) and Siberian ginseng (Eleutherococcus) are different plants with different evidence.
  • Extracts standardised to ginsenoside content are not interchangeable with whole-root grams; a blend listing 35 mg of ginsenosides is not a 3 g root dose.
  • Do not stack with PDE5 inhibitors without clinician sign-off — both act on the nitric oxide pathway.