Limited evidenceMen's health

Pumpkin Seed Oil

The one large, year-long, placebo-controlled trial of pumpkin seed for BPH missed its primary endpoint. Smaller positive trials lack placebo arms or blinding, so this remains a pleasant food with unproven prostate benefits.

What the science says

Relieves lower urinary tract symptoms in BPH Limited evidence
The GRANU trial randomized 1,431 men to pumpkin seed (5 g twice daily), pumpkin seed extract, or placebo for 12 months. The primary endpoint — IPSS reduction versus placebo — was not met, though a secondary responder analysis (at least a 5-point IPSS improvement) modestly favoured whole pumpkin seed over placebo. A well-powered trial that misses its primary endpoint is a negative trial.
Works as well as standard BPH drugs Limited evidence
A single-blind randomized trial compared pumpkin seed oil with tamsulosin and reported both improved IPSS with no significant difference between them. Without a placebo arm and with only single blinding, this design cannot distinguish real equivalence from two arms both riding a large placebo and regression-to-the-mean effect — a known problem in BPH trials where placebo alone often improves IPSS by 3-4 points.
Promotes hair growth in androgenetic alopecia Limited evidence
This claim rests on one small 24-week trial of 400 mg/day pumpkin seed oil reporting increased hair count versus placebo in men. It is a single small study that has not been replicated, with hair-count methodology that is difficult to blind, and no comparison against finasteride or minoxidil.
Improves overactive bladder symptoms Limited evidence
Evidence is limited to small uncontrolled or open-label studies of seed extract in men and women with OAB. Interesting but not sufficient to recommend.

Dosage & safety

Studied doseThe large trial used 5 g of whole pumpkin seed twice daily (10 g/day) for 12 months; extract trials use roughly 320-1,000 mg/day of oil or lipophilic extract. The hair-growth study used 400 mg/day for 24 weeks. Given the negative primary evidence, treat any of these as unproven rather than recommended doses.

SafetyVery safe — pumpkin seed is a food, and adverse events in trials were comparable to placebo, mainly mild GI upset. Whole seeds at 10 g/day add roughly 55-60 kcal, negligible for most people. Theoretical mild antiandrogenic and antiplatelet activity means the usual caution around surgery and anticoagulants applies, though no clinically significant interaction is documented. Pumpkin/cucurbit allergy is rare but real. The main risk is the same as with saw palmetto: men with worsening obstructive symptoms should be evaluated rather than self-treating, since untreated BPH can progress to retention and renal impairment.

Scientific references

Effects of pumpkin seed in men with lower urinary tract symptoms due to benign prostatic hyperplasia in the one-year, randomized, placebo-controlled GRANU study
Vahlensieck W, Theurer C, Pfitzer E, Patz B, Banik N, Engelmann U — Urologia Internationalis, 2015
Pumpkin seed oil (Cucurbita pepo) versus tamsulosin for benign prostatic hyperplasia symptom relief: a single-blind randomized clinical trial
Zerafatjou N, Amirzargar M, Biglarkhani M, Shobeirian F, Zoghi G — BMC Urology, 2021

Where to buy

NOW Foods, Pumpkin Seed Oil, 100 Softgels (1,000 mg per Softgel)

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