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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Myth-buster

Adding saw palmetto to a standard BPH drug outperformed the drug alone in a 12-month trial — but the extra benefit only kicked in after three months, and the study didn't test saw palmetto by itself.

This study suggests saw palmetto may have a role as an add-on therapy for men already taking alfuzosin for enlarged prostate symptoms, but it doesn't change the overall weak evidence for saw palmetto as a standalone treatment — and the trial's design (unclear blinding and funding) means the result should be weighed cautiously.

Men with benign prostatic hyperplasia who took a standardized saw palmetto extract (320 mg/day) alongside the prescription drug alfuzosin reported greater relief from urinary symptoms — such as urgency, frequent urination, and weak stream — than those on alfuzosin alone, with the difference becoming noticeable after three months. However, because the study only tested the combination, it doesn't tell us whether saw palmetto works on its own, and the broader body of evidence for saw palmetto for prostate symptoms remains mixed and low in strength.

Where this fits in the evidence

Pillser has synthesized 4 studies on Saw Palmetto for Improved Lower Urinary Tract Symptoms — overall evidence strength: Low.

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.

The study

Efficacy of Serenoa repens Extract Combined With Alfuzosin Versus Alfuzosin Alone in Men With Lower Urinary Tract Symptoms Due to Benign Prostatic Hyperplasia: A Multicenter Randomized Study.

  • Randomized Controlled Trial (RCT)
  • 2025-10-16
  • The Prostate
More on Saw PalmettoMore on Improved Lower Urinary Tract Symptoms

This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.

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