Educational information, not medical advice — ask your doctor or midwife.
Pumpkin seed is the seed of Cucurbita pepo, the common field pumpkin. People eat it as a food. The hulled green seed is sold as a pepita.
American folk healers and Eclectic doctors used the seed against worms. They also used it for bladder and prostate complaints. Today it is sold mostly for an enlarged prostate and for an urgent bladder.
Here is the short evidence verdict. Human trials are few, small and mixed. Some men report mild relief of urinary symptoms.
Nothing here is proven to shrink a prostate or to clear worms. Traditional use is not proof that a remedy works. It is also not proof that it is safe.
No one has shown how pumpkin seed works in people. The ideas below come mostly from lab and animal work.
In cell studies, plant sterols from the seed appear to interfere with hormone signals in prostate tissue. Whether that happens in a man's body is not established.
In animal work, seed oil has slowed prostate growth driven by testosterone. Animal results often fail to repeat in people.
Some researchers point to the seed's zinc and magnesium. These minerals matter for nerves and for the bladder muscle. That link is a theory, not a proven path.
Cucurbitin, an amino acid in the seed, appears to stun worms in test-tube and animal tests. Strong human evidence for that use is missing.
In the trials done so far, prostate size did not change. If the seed helps at all, it most likely eases symptoms rather than the cause.
Pumpkin seed is sold both as a food and as a supplement.
Whole roasted seeds in the hull, eaten as a snack.
Hulled green seeds, often called pepitas, eaten plain or in food.
Cold-pressed seed oil, dark green, poured over food.
Softgel capsules of the oil, sold for bladder and prostate use.
Dried seed powder and standard extracts, often blended with saw palmetto or nettle root.
Seed tea or a crushed-seed emulsion, an old folk preparation that is rare now.
Seed oil turns rancid fast. Keep it cold and dark. Check the label for the species, since some products use Cucurbita maxima instead.
Pumpkin seed was a standard home remedy in nineteenth century America. Eclectic physicians listed it for tapeworm in their dispensatories. They ground the seeds and mixed them with honey or milk.
Settlers and several Native American groups used the seed and its oil for urinary complaints. German and Eastern European folk practice followed much the same path.
In 1985 the German Commission E reviewed the seed for bladder problems. That review kept it on European pharmacy shelves.
See a doctor rather than treating yourself if urinary symptoms are new or getting worse.
Get help the same day if you cannot pass urine at all.
Get urgent help for blood in your urine, or fever with back or groin pain.
Call emergency services for swelling of the lips, face or throat, or trouble breathing after eating the seeds.
Stop the product and ask for advice if you get belly pain, lasting diarrhoea or a rash.
In the United States, pumpkin seed is an ordinary food. Supplements are sold under dietary supplement rules and may not claim to treat disease.
In Germany, a Commission E monograph listed pumpkin seed for bladder irritation and for urinary symptoms of early prostate enlargement. That is a herbal monograph, not a drug licence. In the UK, the EU and Australia it is sold as a food or a food supplement.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
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