Saw Palmetto Dosage Calculator
A fatty acid-rich berry extract from Serenoa repens. The most widely studied herbal treatment for benign prostatic hyperplasia (BPH) and androgenic alopecia, acting as a 5-alpha-reductase inhibitor without the sexual side effects of pharmaceutical alternatives.
What is Saw Palmetto?
Saw palmetto (Serenoa repens) berry extract contains free fatty acids (lauric, myristic, oleic acids), phytosterols (beta-sitosterol), and aliphatic alcohols that collectively inhibit 5-alpha-reductase (5AR) types I and II — the enzymes that convert testosterone to dihydrotestosterone (DHT). DHT is the primary driver of benign prostatic hyperplasia (BPH) — the non-cancerous enlargement causing urinary frequency, weak stream, and nocturia in 50% of men over 60 — and androgenic alopecia (male and female pattern hair loss). Unlike pharmaceutical 5AR inhibitors (finasteride, dutasteride), saw palmetto does not significantly reduce serum DHT at standard doses and has a markedly better sexual side effect profile — the major limitation of 5AR drugs. For BPH: multiple meta-analyses confirm saw palmetto improves lower urinary tract symptoms (LUTS) scores, peak urinary flow rate, and nocturia. The Cochrane review of 32 RCTs found saw palmetto superior to placebo and comparable to finasteride for BPH symptoms. **Important:** BPH symptoms overlap with prostate cancer — always consult a urologist and undergo PSA testing before self-treating. For androgenic alopecia: 320 mg/day saw palmetto extract over 24 weeks showed 38% improvement in hair density in a 2012 study versus 68% for finasteride — a meaningful effect with vastly fewer sexual side effects. Discuss hair loss treatment options with a dermatologist.
How to Take Saw Palmetto
No established RDA or UL. **Standard dose:** 320 mg/day of a liposterolic extract (standardised to ≥85–95% fatty acids) taken as a single dose or split into two 160 mg doses. This is the dose used in the majority of positive BPH and hair loss RCTs. Generic "powdered berry" products without fatty acid standardisation have highly variable efficacy — always use a standardised liposterolic extract.
Timing Recommendations
Take with a meal — the fatty acid content of saw palmetto is better absorbed with dietary fat co-administration. Single daily dose (320 mg with dinner) is the most commonly used protocol and has comparable efficacy to split dosing.
Potential Side Effects & Safety
Mild GI effects (nausea, diarrhoea) are the most common complaints, occurring in < 10% of users and resolving with food co-administration. Unlike finasteride, saw palmetto does not significantly alter serum PSA — a clinically important distinction since finasteride at BPH doses can mask prostate cancer detection by halving PSA levels.
Who should avoid Saw Palmetto?
Prostate cancer: do not use saw palmetto to self-treat urinary symptoms without excluding prostate cancer via physician evaluation and PSA testing. Pregnancy and breastfeeding: anti-androgenic activity is contraindicated. Anticoagulant medications: rare case reports of increased bleeding tendency; monitor if on warfarin or antiplatelet drugs. Pre-surgical: discontinue 2 weeks before surgery due to potential antiplatelet effects.
Best Stacks with Saw Palmetto
Saw palmetto + beta-sitosterol (60–130 mg/day) for synergistic BPH symptom relief — beta-sitosterol independently reduces LUTS via 5AR and anti-inflammatory mechanisms. For hair loss: saw palmetto + biotin + zinc + collagen peptides as a comprehensive hair health stack. Discuss with your urologist or dermatologist before combining with any pharmaceutical hair loss or BPH treatment.
Scientific References
All dosage recommendations are grounded in peer-reviewed research.
- 1Saw palmetto for benign prostatic hyperplasia
New England Journal of Medicine · 2006
- 2A randomized, double-blind, placebo-controlled trial to determine the effectiveness of saw palmetto on hair loss
Journal of Alternative and Complementary Medicine · 2012
Saw Palmetto Dosage Calculator
Fixed dosage — independent of body weight
Your recommended daily dosage
Formula: 320 mg/day liposterolic extract (≥85% fatty acids) — single or split 2 × 160 mg doses with food
Safety notes
- BPH urinary symptoms: consult a urologist and get PSA testing BEFORE self-treating — these symptoms overlap with prostate cancer.
- Use standardised liposterolic extract (≥85% fatty acids) — unstandardised berry powder is unreliable.
- Unlike finasteride, saw palmetto does NOT significantly lower PSA — prostate cancer screening remains valid.
- Discontinue 2 weeks before surgery — potential antiplatelet activity.
- Anti-androgenic: contraindicated in pregnancy and breastfeeding.
This calculator provides general guidance only. Always consult a qualified healthcare professional before starting any supplement.