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Evidence-Based Supplement Research
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Saw Palmetto and Improved Lower Urinary Tract Symptoms

Research synthesisLow evidenceModerate effect4 studies · 3 beneficial · 1 neutral · 0 harmful

Across 4 studies examining saw palmetto for improving lower urinary tract symptoms (LUTS), 3 reported beneficial effects (mostly moderate in size) and 1 reported a neutral effect; 3 of the 4 findings were statistically significant. The only study reporting an explicit dose used 320 mg/day over 365 days, and the sole study specifying duration showed benefits beginning as early as Month 3. One high-quality RCT in treatment-naïve men with moderate-to-severe LUTS and enlarged prostate found that a saw palmetto extract combined with alfuzosin was significantly more effective than alfuzosin alone, while three reviews provided supporting or mixed evidence.

  • Effective dose range: 320 mg/day
  • Studied populations: treatment-naïve men with moderate-to-severe LUTS (IPSS > 7) and prostate volume > 30 cc

Caveats: Evidence base is small (only 4 studies) — conclusions should be considered preliminary. Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). The sole RCT tested saw palmetto as an adjunct to alfuzosin, not as a standalone therapy, limiting direct inference about monotherapy efficacy.

Generated Jun 13, 2026
Doses used in studies
  • mg/day: 320 (median 320, IQR 320–320) — 1 study
Time to effect
Median: 12.2 months · IQR 12.2 months–12.2 months · Range 12.2 months–12.2 months — Reported in 1 of 4 studies
Safety in these studies
4 of 4 papers
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