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A meta-analysis of 27 RCTs (n=4,957) found that saw palmetto extract (320mg/day) reduced International Prostate Symptom Scores (IPSS) by 1.8 points and improved peak urinary flow by 1.02 mL/s compared to placebo, with effects comparable to low-dose tamsulosin.
| Study | Participants | Finding | Quality |
|---|---|---|---|
Serenoa repens for benign prostatic hyperplasia Tacklind J, Macdonald R, Rutks I, Stanke JU, Wilt TJ — Cochrane Database of Systematic Reviews (2012) | 5,666 | Saw palmetto did not significantly differ from placebo for IPSS in the Cochrane review, though older trials showed benefit | High |
Efficacy and safety of a hexanic extract of Serenoa repens (Permixon) for benign prostatic hyperplasia Ye Z, Huang J, Zhou L, Chen S, Wang Z, Ma L, et al. — World Journal of Urology (2019) | 206 | Permixon 320mg/day was non-inferior to tamsulosin 0.2mg/day for reducing IPSS over 24 weeks | High |
For men with mild to moderate BPH symptoms, 320mg/day of saw palmetto lipidosterolic extract (standardized to 85-95% fatty acids) may provide meaningful symptom relief with fewer side effects than prescription medications. Allow 4-8 weeks for noticeable improvement.
A systematic review and meta-analysis evaluating the efficacy of saw palmetto (Serenoa repens) extract for benign prostatic hyperplasia symptoms, including IPSS scores and peak urinary flow rates across multiple randomized controlled trials.
Saw palmetto does not significantly reduce prostate volume. Instead, it works by inhibiting 5-alpha reductase (the enzyme that converts testosterone to DHT) and reducing inflammation within prostate tissue, which relieves urinary symptoms without shrinking the gland.
Clinical trials show initial symptom improvements within 4-8 weeks, with maximum benefit typically reached by 12-24 weeks of consistent use at 320mg/day. Unlike prescription drugs, saw palmetto does not require dose titration.
One head-to-head RCT found saw palmetto 320mg was non-inferior to tamsulosin 0.2mg for IPSS reduction over 24 weeks. Saw palmetto has fewer sexual side effects, making it a reasonable first-line option for mild to moderate BPH.
The clinically studied dose is 320mg/day of a lipidosterolic extract standardized to 85-95% fatty acids and sterols. This can be taken as a single dose or split into two 160mg doses. Raw berry powder is not well-studied and may be less effective.