Saw palmetto: the prostate dose, the evidence, and cost
Quick answer
The standard saw palmetto dose is about 320 mg/day of an extract standardized to 85-95% fatty acids and sterols, so compare products by cost per standardized 320 mg dose, not per capsule.
Alex Soto, Founder, VitaminDB
6 min readUpdated 8/1/2026 NIH-sourced
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The standard saw palmetto dose is about 320 mg/day of an extract standardized to roughly 85-95% fatty acids and sterols, usually taken as 160 mg twice daily. The one thing to get right before buying: compare products by the cost per standardized 320 mg dose, not by price per capsule, because capsule sizes and standardization vary widely.
What saw palmetto is
Saw palmetto (Serenoa repens) is an extract from the berries of a small palm native to the southeastern United States. It is the most popular herb men use for the urinary symptoms of benign prostatic hyperplasia (BPH) — the non-cancerous prostate enlargement that becomes common with age and can cause weak stream, frequent urination, and getting up at night.
The active fraction is a set of fatty acids and sterols in the berry oil. That is why standardization matters: a capsule of raw ground berry powder is not the same as a standardized lipid extract, even at the same milligram count.
The dose
The dose used in most research is:
- About 320 mg/day of a standardized extract, often split as 160 mg twice daily.
- Standardized to roughly 85-95% fatty acids and sterols.
- Taken with food, which can reduce stomach upset.
If a product lists "saw palmetto berry" without a standardization spec, you cannot assume it delivers the same active content as the 320 mg standardized extract used in trials. Follow the specific product's label, and give any trial several weeks before judging it. This is general information, not medical advice.
What the evidence actually shows
Here is the honest summary: the evidence is mixed.
- Some earlier and smaller trials suggested modest improvement in urinary symptoms.
- Several large, well-designed, placebo-controlled trials found saw palmetto no better than placebo, even at higher doses.
So saw palmetto sits in an uncomfortable middle: widely used, generally well tolerated, but without consistent proof that it beats a placebo for BPH symptoms. Some men report they feel a difference; the controlled data as a whole does not strongly support it. A reasonable framing is that it may help some people modestly, but it is not an established treatment, and effective prescription options exist for BPH. Persistent or worsening urinary symptoms deserve a medical evaluation rather than self-treatment. Not medical advice.
What saw palmetto is not
This matters enough to state plainly:
- It is not a treatment for prostate cancer.
- It does not reliably lower PSA (prostate-specific antigen).
- It should not replace a workup for urinary symptoms, which can have several causes.
If you have a rising PSA, urinary changes, or any prostate concern, that is a conversation for a doctor. A supplement that quietly masked a symptom without addressing the cause would be the worst outcome. Not medical advice.
The label details that matter
Because the active is the standardized lipid fraction, check for:
- A standardization claim — ideally 85-95% fatty acids and sterols — not just "berry" milligrams.
- The daily dose the bottle delivers, so you can line it up against the 320 mg/day benchmark.
- Third-party testing where available.
A bottle advertising a big milligram number of unstandardized berry powder can be weaker than a smaller, properly standardized extract. Volume on the front label is not the same as active content.
How to buy saw palmetto by cost per dose
Do not compare bottles by price per capsule — capsule size and standardization differ, so that number is misleading. Instead:
- Anchor on a standardized 320 mg/day dose.
- Divide the bottle price by how many 320 mg days it provides to get a real cost per dose.
- Favor standardized extracts, since they are the only products you can compare fairly.
Compare current prices per dose on /nutrients/saw-palmetto, see the best current value picks on /best/saw-palmetto, and read exactly how we calculate cost per dose on /methodology.
Buy the standardized 320 mg option with the lowest cost per dose, keep expectations modest given the mixed evidence, and take any real prostate concern to a clinician.
Covered nutrients: saw-palmetto
See the live cost-per-dose data
This guide is editorial — the prices below are real and current.
Frequently asked questions
How much saw palmetto should I take per day?
The commonly studied dose is about 320 mg per day of an extract standardized to roughly 85-95% fatty acids and sterols, often taken as 160 mg twice daily. Follow the product label. This is general information, not medical advice.
Does saw palmetto work for an enlarged prostate (BPH)?
The evidence is mixed. Some trials suggest modest relief of urinary symptoms, but several large, well-designed trials found it no better than placebo. Treat it as unproven rather than established, and talk to a clinician about persistent urinary symptoms. Not medical advice.
Does saw palmetto lower PSA or treat prostate cancer?
No. Saw palmetto is not a treatment for prostate cancer and does not reliably lower PSA. Any prostate-cancer concern or abnormal PSA needs a doctor, not a supplement. Not medical advice.
How do I compare saw palmetto cost per dose?
Compare the price against a standardized 320 mg daily dose, not per capsule, since capsule sizes and standardization differ. Divide the bottle price by how many 320 mg days it provides.
Deals on these nutrients
Hair Skin and Nails Supplement – 5-in-1 Formula Collagen…
Cost per serving
$0.37
60 servings · ~60-day supply
Saw Palmetto 160mg Std Extract 60 Softgels by Now
Cost per serving
$0.26
60 servings · ~60-day supply
Collagen Biotin Supplement
Cost per serving
$0.11
150 servings · ~150-day supply
Saw Palmetto Extract 500mg - SuperSmart | with Saw Palmetto
Cost per serving
$0.60
30 servings · ~30-day supply
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