Pumpkin Seed Oil

What is pumpkin seed oil?

Pumpkin seed oil is pressed from the seeds of Cucurbita pepo, the same species as many squashes and the Styrian oil pumpkin grown in Austria. It is rich in linoleic and oleic acids, vitamin E, carotenoids and plant sterols, including a group called delta-7 sterols. Pumpkin seeds have a long folk reputation in Central Europe and North America for supporting the bladder and prostate, and pumpkin seed products are common ingredients in men’s urinary health supplements.

What the research says

Enlarged prostate symptoms

In a randomized, double-blind trial in Korea, 47 men with an enlarged prostate and moderate symptoms took 320 mg a day of pumpkin seed oil, saw palmetto oil, both, or a placebo for 12 months. Symptom scores fell from baseline in the oil groups within three months, and peak urine flow improved significantly after six months with pumpkin seed oil. Prostate size did not change, and the combination of both oils was not better (Hong et al., 2009). The groups were very small, and the main comparisons were against baseline rather than placebo.

The German GRANU study was much larger. It randomized 1,431 men aged 50 to 80 to whole pumpkin seed (5 grams twice a day), pumpkin seed extract capsules (500 mg twice a day) or placebo for a year. The extract capsules did not beat placebo on the main response measure. Whole seed showed a higher responder rate (58.5% versus 47.3%), which the authors described as clinically relevant, but they said the findings should be confirmed before pumpkin seed can be fully recommended. Both products were well tolerated (Vahlensieck et al., 2015).

How it might work

Laboratory and animal studies suggest pumpkin seed sterols may influence 5-alpha-reductase, the enzyme that converts testosterone into the more potent DHT, and may have anti-inflammatory effects. These mechanisms are plausible but not proven in people. There is no human evidence that pumpkin seed oil “strengthens” the urethra wall, a claim made in some marketing.

Putting the evidence together

The results are encouraging but not conclusive. Effects appear modest, the strongest signal came from large amounts of whole seed rather than extract, and few independent trials exist.

How it’s used in supplements

Pumpkin seed oil is sold in softgels, often at 500 to 1,000 mg, and is frequently combined with saw palmetto, beta-sitosterol or pygeum in prostate formulas. Eating roasted pumpkin seeds is another option. It is generally well tolerated, though mild stomach upset is possible. Because urinary symptoms can have many causes, men should see a doctor for evaluation before self-treating, and should tell their doctor if they take prostate medicines, diuretics or blood thinners.