Benign prostatic hyperplasia (BPH) is a non-cancerous enlargement of the prostate. The NIDDK estimates it affects 5% to 6% of men aged 40 to 64 and 29% to 33% of men 65 and older, and calls it the most common prostate problem after 50. Urinary symptoms can also come from infections, bladder problems or prostate cancer, so get them checked before you buy anything. See a doctor right away if you cannot urinate at all, see blood in your urine, or have painful, urgent urination with fever and chills.
- Beta-sitosterol: a 1999 systematic review (4 trials, 519 men, 4 to 26 weeks) found better symptom scores and urine flow than placebo. It did not shrink the prostate, and long-term effects are unknown.
- Pygeum africanum: a Cochrane review of 18 small, short trials (1,562 men) found men were about twice as likely to report improvement as on placebo. The trials used different doses, so there is no proven dose.
- Pumpkin seed: mixed. In the largest trial (1,431 men, 12 months), pumpkin seed extract did no better than placebo.
- Saw palmetto: the most common prostate ingredient, and one of the weakest. A 2023 Cochrane review of 27 trials found it gives "little to no" benefit on its own, and the NIH-funded CAMUS trial found no benefit even at three times the usual dose. More on our saw palmetto page.
- Zinc: we found no randomised trial of zinc for BPH symptoms. The NHS advises no more than 25 mg a day from supplements.
- Claims that a product will "shrink the prostate". In the trials above, prostate size did not change. See Do prostate supplements actually shrink the prostate?
- Formulas built around saw palmetto, or that sell a special saw palmetto extraction method. NCCIH reports no difference between extraction types.
- Proprietary blends that hide how much of each ingredient you get.
- High-caffeine formulas. The NIDDK advises men with BPH to limit caffeine and alcohol.
Treat supplements as an add-on to medical care, never a replacement. The NIDDK lists alpha blockers, 5-alpha reductase inhibitors and minimally invasive procedures as standard treatments. It also warns that decongestants, antihistamines, tranquilizers, antidepressants and diuretics can worsen symptoms. If you choose a supplement, pick one whose lead ingredient has trial data (beta-sitosterol or pygeum), check that every dose is disclosed, and review symptoms with your doctor after a few months. According to NCCIH, saw palmetto does not appear to affect PSA readings, but tell your doctor about any supplement before a PSA test anyway.
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