Pumpkin Seeds

We evaluated 15 human studies on Pumpkin Seeds, including 2 randomised controlled trials and 0 meta-analyses or systematic reviews; the controlled studies include 189 participants in total. As of 23 October 2026.

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1. What Is Pumpkin Seeds? Occurrence, Origin and Forms

Pumpkin seeds are the seeds of the pumpkin (genus Cucurbita) in the gourd family (Cucurbitaceae). They sit in the flesh of the ripe fruit and are eaten as food or pressed into oil. In folk medicine they were traditionally used for bladder and prostate complaints and against tapeworms.

The seeds grow inside the fruits of all Cucurbita species; dedicated oilseed varieties produce seeds without a woody hull, which press well. They are eaten as a snack and a baking ingredient, and they also serve as a culinary oil.

The seeds are taken from the ripe fruit, washed and dried, with or without the hull; this yields roasted seeds, cold-pressed oil as well as flour, powder and protein. Investigations use whole seeds, hulled seeds, roasted seeds, pumpkin seed oil as well as flour, powder and protein extract.

Forms and Preparations Studied

• Whole Seeds With Hull
• Hulled Seeds, the Kernel Without the Hull
• Roasted Seeds
• Pumpkin Seed Oil
• Pumpkin Seed Flour or Powder
• Pumpkin Seed Protein

Not covered on this page:

• Pumpkin flesh, pumpkin juice and other preparations made from the fruit rather than the seed
• Seeds of other cucurbits such as melon and watermelon seeds
• Saw palmetto (Serenoa repens), a different plant mentioned in the same context
• Finished products in which pumpkin seed extract is only one ingredient alongside other active substances

2. What Does Pumpkin Seeds Do? Results by Area

How to read the table: counted are human studies whose results concern the area. “High” means at least one meta-analysis and two controlled studies showing improvement, or at least three controlled studies of which three quarters show improvement, with at least 300 participants in total. “Moderate” means at least two controlled studies showing improvement, as a majority, or one meta-analysis alongside controlled studies. “Low” means one controlled study showing improvement. Where an area has no controlled study, the strength of evidence is at most “low” (result “reviews only” or “observational data only”). Everything else is “unclear”. A study counts as showing improvement when at least half of its outcomes in this area improved. Reviews of combination products do not count as meta-analyses; results that only describe side effects or shares of users do not count as an effect. The same study is counted only once.

3. What the Studies Show in Detail

Pumpkin Seeds, Prostate and Benign Enlargement: Human Studies

A randomized controlled trial with 53 men with symptoms of benign prostatic enlargement found a better subjective assessment of the treatment effect with Curbicin, a preparation of pumpkin seeds and Sabal serrulata (dwarf palm/saw palmetto), compared with placebo 1. An older review mentions more recent studies on pumpkin seeds with clinical effects but considers the role of such plant extracts in prostate complaints controversial 14. The evidence is unclear: only one controlled study is available, and it investigated a combination preparation. It remains open whether whole, hulled or roasted seeds, oil, flour, powder or protein alone work for this complaint.

Pumpkin Seeds, Bladder and Urinary Tract: Human Studies

A randomized controlled trial with 53 men with symptoms of prostatic hyperplasia found an improvement in urinary flow, micturition time, residual urine and micturition frequency with a preparation of pumpkin seeds (Cucurbita pepo) and Sabal serrulata (dwarf palm/saw palmetto) compared with placebo 1. Since the investigated preparation additionally contained Sabal serrulata, the finding cannot be attributed to the pumpkin seeds alone 1. The evidence for this area is unclear; only this one controlled study on a combination preparation is available, and it remains open whether pumpkin seeds alone influence the bladder and urinary tract complaints.

Pumpkin Seeds and Blood Glucose: Human Studies

In this area, a randomized controlled trial was conducted in healthy adults that compared a protein mixture of pumpkin seed protein together with pea protein and brown rice protein against whey and water 2. After whey, insulin rose more strongly shortly after intake than after the plant-based mixture; overall, the authors found comparable metabolic effects 2. Since the preparation contained pea and brown rice protein in addition to pumpkin seed protein, this finding cannot be attributed to the pumpkin seeds alone 2. The evidence is unclear: only this one small study with 15 participants is available, and pumpkin seed protein was investigated, not whole, hulled or roasted seeds, oil, flour or powder. Whether other forms of pumpkin seeds affect blood sugar or insulin therefore remains open.

Pumpkin Seeds and Blood Pressure: Human Studies

For blood pressure, there is only a general overview of dietary patterns that incidentally lists pumpkin seeds among blood-pressure-lowering foods and itself calls for further studies 13. Controlled human studies on blood pressure and a single pumpkin seed form are lacking to date, so the strength of evidence remains unclear.

Pumpkin Seeds: Further Outcomes in Studies

In this area, three controlled studies show findings on very different forms and questions that cannot be reduced to a common denominator. In tapeworm infestation, pumpkin seeds with areca nut extract expelled the worms most quickly; pumpkin seeds alone also worked, but markedly more slowly 3. In a small study, baked pumpkin seeds after a sugar rinse accelerated the recovery of plaque pH; eaten alone, they slightly lowered it 4. The strength of evidence is low: the studies are small or not randomized, and no controlled human findings are available in this area for pumpkin seed oil, flour, or powder.

Further studies in this area: 10 11 12

4. How Is Pumpkin Seeds Dosed? Preparation, Dose and Duration in Studies

The pumpkin seeds were often part of a mixture, for example with Sabal serrulata (dwarf palm/saw palmetto), with pea and brown rice protein or with areca nut extract 123. For pumpkin seed oil, pumpkin seed flour and pumpkin seed powder, no controlled findings from the included human studies are available.

5. Is Pumpkin Seeds Safe? Side Effects in Studies

In the randomized controlled trial on the combination preparation with Sabal serrulata, no adverse side effects were observed 1. In the tapeworm study, temporary nausea and dizziness occurred in nearly half of the participants taking pumpkin seeds with areca nut extract 3. Individual reports also mention allergic reactions up to anaphylaxis as well as a Salmonella infection in connection with pumpkin seeds 5711.

6. What Remains Open: Limits of the Evidence

• For prostate and urinary tract complaints, only one controlled study is available, and it also investigated a combination preparation with Sabal serrulata 1.
• The exact form of the pumpkin seeds in the combination preparation was not stated 1.
• For pumpkin seed oil, pumpkin seed flour and pumpkin seed powder, controlled human studies are lacking.
• The study on blood sugar was small and tested a protein mixture of pea, brown rice and pumpkin seeds against whey, not pumpkin seeds alone 2.

7. Bottom Line: What Is Established About Pumpkin Seeds

Pumpkin seeds are the seeds of the pumpkin and are eaten as a food or pressed into oil. The human studies are limited: the focus is on men with benign prostatic enlargement, in whom a preparation of pumpkin seeds and Sabal serrulata performed more favorably than placebo 1. Since this preparation contains two components, the finding cannot be attributed to the pumpkin seeds alone 1.

The evidence is low or unclear throughout: there are only a few small studies, mostly with combination preparations, and for oil, flour and powder, controlled human findings are lacking. Statements about one form cannot readily be transferred to another.