Saw Palmetto Dosage: 320mg Standardized Extract (Evidence Still Null)
Educational summary — not medical advice. This is the studied dose, not a dose shown to work — the strongest trials are null. Urinary or prostate symptoms need a clinician. This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.
The honest answer
The studied dose is 320 mg/day of a standardized lipidosterolic extract (~85–95% fatty acids/sterols) — typically one 320 mg softgel or two 160 mg softgels. But be clear about what that dose achieved: the STEP (Bent 2006) and CAMUS (Barry 2011) trials found no benefit over placebo at 320 mg — and CAMUS saw nothing even at up to 3× that dose. So 320 mg is the dose the trials used, not a dose proven to help. The one thing you can control is whether you're getting a disclosed, standardized extract — and only 5 of 14 products we track are.
The key thing most people get wrong: the dose is a standardized extract
The trials didn't dose "saw palmetto berries" — they dosed a standardized lipidosterolic extract, the berry concentrated to about 85–95% fatty acids and sterols, at 320 mg/day (Bent 2006). That's the reference dose. What it is not is a dose shown to work: STEP found no difference from placebo, and CAMUS escalated to double and then triple the dose and still found no benefit for urinary symptoms (Barry 2011), a result the 32-trial Cochrane review confirmed (Tacklind 2012). So the practical dosing question isn't "how much works" — it's "if I try it anyway, am I even getting the standardized 320 mg the research used, or an unstandardized berry powder?"
| Question | Answer |
|---|---|
| How much? | 320 mg/day standardized extract (~85–95% FA/sterols) |
| Does that dose work? | No — no benefit over placebo for BPH symptoms (STEP, CAMUS, Cochrane) |
| Any point going higher? | No — CAMUS found no benefit even at up to 3× the dose |
| How is it standardized? | To a stated % fatty acids and sterols — disclosed as a per-serving extract mg |
| Does it lower PSA? | No — no PSA effect (Andriole 2013) |
| Can I verify it from the label? | Usually no — only 5 of 14 products disclose a standardization % |
Checker: are you getting the standardized 320 mg?
This only works if your product discloses a standardized extract — most don't, which is the whole point. If your label states a standardized extract mg per serving (with a % fatty acids/sterols), enter it with your servings per day to see your daily standardized extract in mg and what % of the 320 mg studied dose you're getting.
Where to find the number: look for "standardized to 85–95% fatty acids and sterols" and a per-serving extract mg on the Supplement Facts panel. If the label only says "450 mg whole berry," "900 mg full spectrum," or "2400 mg equivalent," the extract is non-standardized — you can't use this, and that's the finding.
How to take it (if you try it)
- Target a disclosed, standardized 320 mg/day — the amount the trials used (Bent 2006); more didn't help (Barry 2011).
- Don't expect it to work. The best evidence is null for BPH symptoms — set expectations accordingly (the honest evidence).
- Prioritize a disclosed standardization over a big "equivalent" number. A capsule standardized to a stated extract mg is the only way to know what you're taking — see standardized vs berry powder.
- Get evaluated for real symptoms. Urinary changes and prostate concerns need a clinician; saw palmetto doesn't lower PSA and can't substitute for assessment.
- Prudence notes (not trial findings): if you take anticoagulants or have a hormone-sensitive condition, check with a clinician first — a theoretical caution, not a demonstrated harm.
The most-verifiable pick
The honest picks here are the 5 products that disclose a standardized extract and reach the studied 320 mg/day — useful because you can verify the dose, not because it's proven to work. The cheapest of them is below; full ranking on best saw palmetto.
Discloses a standardized lipidosterolic extract reaching the studied 320 mg/day — the rare product where cost per studied dose is real, at $0.22/day. Verifiable, not proven effective.
As an Amazon Associate we earn from qualifying purchases. Ranked by disclosed standardization, never commissions.
Frequently asked questions
How much saw palmetto should I take per day?
The studied dose is 320 mg/day of standardized extract (~85–95% FA/sterols). But that dose showed no benefit over placebo for BPH in STEP and CAMUS — it's the studied dose, not a dose proven to work.
Does taking more work better?
No. CAMUS escalated to up to 3× the standard 320 mg and still found no benefit. A bigger "berry equivalent" isn't even more standardized extract — it's raw-fruit weight with an undisclosed active fraction.
How do I know I'm getting the standardized 320 mg?
Look for a stated % fatty acids/sterols and a per-serving extract mg. "450 mg whole berry," "900 mg full spectrum," and "2400 mg equivalent" are non-standardized. Only 5 of 14 products disclose a standardized extract.
How long to work, and is it safe?
There's no reliable time-to-effect because the trials found no benefit over placebo even after 6–12 months. It was well tolerated (Avins 2008). As prudence (not a trial finding), those on anticoagulants or with hormone-sensitive conditions should check with a clinician.
Does saw palmetto have side effects, and who should be cautious?
It's generally well tolerated, with occasional mild digestive upset the most common complaint. There's a theoretical bleeding risk, so use caution with blood thinners and before surgery, and because it acts on hormone pathways, people who are pregnant or on hormone-sensitive therapy should check with a clinician first. Talk to your clinician before starting it if you take medications or have a health condition.
Related
- Standardized extract vs berry powder — why the big "equivalent" number isn't the studied dose
- Best saw palmetto — ranked by disclosed standardization, then cost per day at 320 mg
- Does saw palmetto work? — the honest null evidence for BPH, PSA and hair loss
Sources
- Bent S, et al. "Saw palmetto for benign prostatic hyperplasia." N Engl J Med. 2006. PMID: 16467543 (STEP — 320 mg standardized extract, null).
- Barry MJ, et al. "Effect of increasing doses of saw palmetto extract on lower urinary tract symptoms." JAMA. 2011. PMID: 21954478 (CAMUS — no benefit at up to 3× dose).
- Tacklind J, et al. "Serenoa repens for benign prostatic hyperplasia." Cochrane Database Syst Rev. 2012. PMID: 23235581 (32 RCTs, no benefit).
- Andriole GL, et al. "Effect of increasing doses of saw palmetto extract on serum PSA." J Urol. 2013. PMID: 23253958 (no PSA effect).
- Avins AL, et al. "A detailed safety assessment of a saw palmetto extract." Complement Ther Med. 2008. PMID: 18534327 (well tolerated).
- Full product dataset: /saw-palmetto/cost-by-brand.json (CC BY 4.0).