Saw Palmetto and Prostate Supplements: What Research Shows
What research shows on saw palmetto and prostate supplements: a Cochrane review of 27 trials found little or no benefit for urinary symptoms, plus safety notes and uses not proven.
Content last updated . This page has not been medically reviewed.
What saw palmetto is
Saw palmetto (Serenoa repens) is a small palm native to the southeast coast of North America and the West Indies. Its berries are used as a dietary supplement, often promoted for urinary symptoms of an enlarged prostate (benign prostatic hyperplasia, BPH), male-pattern hair loss and chronic prostatitis/chronic pelvic pain syndrome. [1] For plant background, see the Saw palmetto herb profile.This page uses these evidence labels: established recommendation, promising but limited, mixed, insufficient evidence.
What research shows
| Use | What the sources found | Evidence |
|---|---|---|
| Urinary symptoms of BPH | A 2023 Cochrane review of 27 studies (4,656 men, mostly over 50 with moderate symptoms) concluded that saw palmetto alone provides little to no benefit. In the analysis limited to lower-risk-of-bias studies, the difference in symptom score at 3 to 6 months was small (mean difference -0.90 points on a 0 to 35 scale) and the review rated this high-certainty evidence. [2] NCCIH concludes it is probably not helpful for this purpose. [1] | Little or no benefit |
| Combinations with other herbs | The Cochrane authors said there is more uncertainty about combination products. [2] | Insufficient evidence |
| Different extracts | Reviewers found no difference in effect between hexane-extracted products and others. [1] | No difference found |
| Chronic prostatitis / pelvic pain | A 2022 review of five studies did not find a significant benefit. [1] | Little or no benefit |
| Male-pattern hair loss | A few small studies; the evidence is too limited to reach conclusions. [1] | Insufficient evidence |
Two NIH-funded trials in the review tested a standard dose, and increasing doses up to three times the usual dose, of saw palmetto alone; neither improved BPH symptoms. [1]
NIDDK still lists plant extracts including saw palmetto among "alternative" approaches that have been used for chronic prostatitis/chronic pelvic pain syndrome, and asks people to discuss supplements with their provider. [3] Listing an approach is not the same as showing that it works.
"Prostate health" blends
Many products combine saw palmetto with other ingredients. The Cochrane review could not reach definite conclusions about such combinations. [2] The label cannot tell you whether the amounts match anything studied; see Reading supplement labels and How supplements are regulated.Practical points
- Do not use a supplement in place of getting urinary symptoms checked; other conditions, including prostate cancer, can look the same at first. [4]
- Established medical options for BPH (watchful waiting, medicines, procedures, surgery) are described on Urinary symptoms and enlarged prostate. [5]
- Never stop a prescribed medicine to try a supplement.
Frequently asked questions
Does saw palmetto work for an enlarged prostate?
A 2023 Cochrane review of 27 studies found little to no benefit for urinary symptoms when saw palmetto is used alone. [2]
Is saw palmetto safe?
It is well tolerated in studies lasting up to 3 years, with mild side effects, but it may be unsafe in pregnancy and can interact with medicines. [1]
Does saw palmetto affect PSA tests?
It does not appear to affect PSA readings. [1]
What about saw palmetto for hair loss?
The evidence is too limited to say. [1]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety
- Saw palmetto is well tolerated. In research studies it has been used safely for up to 3 years, and side effects are mild and infrequent, including digestive symptoms, dizziness and headache. [1]
- It does not appear to change PSA readings, even in higher-than-usual amounts. [1] That is reassuring, but it also means a supplement will not signal or hide a prostate problem.
- It may be unsafe during pregnancy or breastfeeding. [1]
- Dietary supplements are not approved by the FDA before sale. [1]
- If you take any medicine, talk with your health care provider before using any herbal product, because some herbs and medicines interact harmfully. [1] See Medication interactions.
When to get help
References
- NCCIH (NIH). Saw Palmetto: Usefulness and Safety. Read 2026-10-22.
- Franco JV, et al. Serenoa repens for the treatment of lower urinary tract symptoms due to benign prostatic enlargement. Cochrane Database Syst Rev 2023. Read 2026-10-22.
- NIDDK (NIH). Prostatitis: Inflammation of the Prostate. Read 2026-10-22.
- NHS. Enlarged prostate. Read 2026-10-22.
- NIDDK (NIH). Enlarged Prostate (Benign Prostatic Hyperplasia). Read 2026-10-22.