Research synthesisVery low evidenceSmall effect3 studies · 1 beneficial · 2 neutral · 0 harmful
Across 3 studies, 1 reported a small beneficial effect on quality of life, while 2 reported neutral effects with small effect sizes. The median study duration was approximately 7.75 years (2828 days), indicating that effects were assessed over long-term use; however, the evidence base is very small and predominantly neutral. The most studied population was men with lower urinary tract symptoms due to benign prostatic enlargement or hyperplasia, with one study using 320 mg once daily of saw palmetto extract.
- Effective dose range: 320 mg once a day
- Studied populations: men with lower urinary tract symptoms due to benign prostatic enlargement or benign prostatic hyperplasia
Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests. The only beneficial finding came from a small (n=30) observational study without a control group, and the two meta-analyses with larger sample sizes found neutral effects with uncertain or non-significant results.
Generated Jun 11, 2026