Will saw palmetto regrow my hair?

Saw palmetto's hair-loss evidence is for *slowing progression*, not dramatic regrowth. Expect to maintain what you have rather than reverse Norwood 4 to Norwood 1. The effect size is smaller than finasteride's. For meaningful regrowth, the most effective non-prescription approach pairs minoxidil topical with internal saw palmetto.

Saw palmetto vs finasteride — which is better for BPH?

Finasteride produces larger symptom improvements (~50% vs saw palmetto's ~25%) and is the right choice for moderate-to-severe BPH. Saw palmetto has a far better side-effect profile, particularly sexual side effects (1–2% vs 5–8%), and is the right starting point for mild symptoms or for men intolerant of finasteride.

Does saw palmetto affect PSA tests?

Yes — it can lower PSA readings by approximately 30–50% via its 5-AR inhibition. Your urologist needs to factor this in when interpreting screening results. Always disclose saw palmetto use before PSA testing.

Updated April 2026Evidence-Based

Saw Palmetto for Prostate and Hair Loss: Dosage and Evidence

Also known as: Serenoa repens

Saw palmetto is the lipidic extract of the Serenoa repens berry. It is the most-used phytotherapeutic for benign prostatic hyperplasia (BPH) in Europe, with over 50 published clinical trials. Standardised lipid extracts (the form used in clinical trials) consistently show modest improvements in urinary symptoms and a much gentler side-effect profile than 5-alpha-reductase inhibitors like finasteride.

How Saw Palmetto Works

Saw palmetto's lipidic extract weakly inhibits the type-2 isoform of 5-alpha-reductase, the enzyme that converts testosterone into dihydrotestosterone (DHT) — the hormone driving both BPH and androgenetic alopecia. It also reduces prostate inflammation by modulating COX-2 and 5-lipoxygenase pathways and may have anti-androgen receptor binding effects.

Benefits

BPH symptoms: 20–30% improvement in urinary flow and nighttime urgency in men with mild-to-moderate BPH.
Androgenetic alopecia: emerging evidence for slowing hair-loss progression in men.
Sexual side effects: much lower rate than finasteride — saw palmetto rarely causes erectile or libido changes.
Inflammatory markers in prostate tissue: histological improvements in trial biopsies.

Research Summary

Cochrane reviews historically split on saw palmetto's BPH efficacy because early trials used non-standardised preparations. Trials using the standardised lipidic extract (Permixon, Prostagutt) show consistent modest benefit (Boyle 2004, Carraro 1996). More recent meta-analyses focusing on standardised preparations show statistically significant symptom improvement vs placebo.

Recommended Dosage

Min effective dose

320 mg/day standardised lipidic extract

Max safe dose

640 mg/day (short-term in trials)

320 mg/day of the standardised lipidic extract (typically 85–95% fatty acids and sterols). This is the dose used in essentially all positive trials. Powdered berry preparations require 1–2 g/day for similar effect and are less consistent. Take with a fatty meal for absorption.

Side Effects

Mild GI upset on an empty stomach. Headache, dizziness in 1–3% of users. Rare: liver enzyme elevations (case reports). Sexual side effects (erectile dysfunction, libido reduction) occur in <2% — far less than finasteride's 5–8%.

Interactions

Antiplatelet/anticoagulant medications — saw palmetto has mild antiplatelet activity. Hormone-sensitive medications — discuss with prescriber. Notably interferes with PSA testing — your urologist needs to know you're taking it before interpreting PSA results.

Best Supplements Containing Saw Palmetto

Prostan Plus— 4.7/5
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Folicerin— 4.6/5
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Folisin— 4.5/5
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Yara Hair Growth Vitamins— 4.3/5
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PotentStream— 4.3/5
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ProstaLite— 4.3/5
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Prostastream— 4.3/5
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Advanced Prostate Formula— 4.3/5
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Prostabliss— 4.3/5
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ProstaPure— 4.3/5
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Frequently Asked Questions

Medical Disclaimer

The content on this page is for informational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult your physician or qualified healthcare provider before starting any new supplement regimen. Individual results may vary.