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Serenoa repens (Saw Palmetto)
Inhibits 5-alpha reductase and reduces prostate inflammation — commonly used for BPH urinary symptoms with mixed but positive reports.
What the evidence says
Saw Palmetto appears to help in 5 of 7 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 2005–2026 with a typical study size of 320 participants.
Based on 41 studies · 6 meta-analyses · 26 RCTs · 40,774 total participants
Confidence
HighWhat the studies found
By outcome
See full supplement plans that include Saw Palmetto.
Saw Palmetto has an evidence score of 8/10 — strong evidence based on 41 indexed studies, including 3 meta-analyses. Inhibits 5-alpha reductase and reduces prostate inflammation — commonly used for BPH urinary symptoms with mixed but positive reports.
The commonly studied dose of Saw Palmetto is 320mg standardized extract (85-95% fatty acids). Research points to an estimated optimal dose around 320mg, with a minimum effective dose near 320mg. Individual response varies — start low and adjust.
The best time to take Saw Palmetto is with meals. Take it with food. Saw palmetto (Serenoa repens) liposterolic extract contains fatty acids and phytosterols that inhibit 5-alpha-reductase and modulate androgen signaling.
Last reviewed May 2026 · evidence from 39 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Saw Palmetto is extracted from the berries of a small palm tree native to the southeastern United States. It's the most commonly used herb for prostate health, particularly benign prostatic hyperplasia (BPH). While evidence is mixed, many men report improved urinary symptoms. Works through anti-androgenic and anti-inflammatory mechanisms.
Reduces DHT production in prostate
Reduces prostate inflammation
How Saw Palmetto works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
320mg standardized extract (85-95% fatty acids)
Take with food
| Form | Type |
|---|---|
| 💊Liposterolic extract (standardized to 85-95% fatty acids) | Recommended |
| 💊CO2 extract | Alternative |
| 🧪Dried berry powder (less effective) | Alternative |
The fatty acid fraction is the active component. Standardized extracts are more reliable than raw berry.
Minimum: 8 weeks
Optimal: 24 weeks
Cycling: Not required
Note: Fat-soluble — take with food for better absorption. Can split into two doses.
Mixed evidence from meta-analyses. Some show significant improvement in maximum urinary flow rate vs placebo, while others show no clinically meaningful improvement. Hexanic lipidosterolic extracts (like Permixon) showed most consistent results. Effectiveness is conservative due to conflicting study outcomes.
Better urinary flow and less frequency
Fewer trips to bathroom at night
Not intended for women; may affect hormones
Contraindicated during pregnancy and breastfeeding due to anti-androgenic and hormonal effects. May interfere with fetal development.
May have mild antiplatelet effects — may affect platelet aggregation or vitamin K-dependent clotting factors, altering anticoagulant efficacy
Similar mechanism — may be additive
May have hormonal effects
Tip: Take with food
Tip: Usually resolves
Tip: Much less common than with finasteride
Often combined for prostate support
Enhanced BPH symptom relief
Prostate has high zinc requirements
Comprehensive prostate nutrition
Often combined for prostate support
Enhanced prostate health support
Both support prostate health through different mechanisms
Enhanced prostate and urinary support
Both inhibit 5-alpha reductase through complementary phytosterol mechanisms, potentially providing additive BPH and hair loss benefits
Enhanced DHT reduction and prostate symptom relief
Saw Palmetto is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are GI upset, headache, erectile dysfunction (rare). Use caution if any of these apply to you: Known allergy or hypersensitivity to Saw Palmetto or related compounds; Hormone-sensitive conditions (breast cancer, endometriosis, uterine fibroids); Pregnancy and breastfeeding.
Pumpkin Seed Oil
Mostly mechanism / observationalA cold-pressed oil rich in phytosterols, zinc, and unsaturated fatty acids shown to support prostate health, hair growth, cardiovascular function, and hormonal balance.
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