Pumpkin seed oil
Summary
In one 24-week trial of 76 men with pattern hair loss, 400 mg/day of a pumpkin seed oil product raised hair counts 40% vs 10% on placebo (grade C). For prostate-related urinary symptoms, a 1,431-man year-long trial found the extract no better than placebo, while whole seeds did slightly better (grade C, mixed).
Key facts
- Hair count in male pattern hair loss ↑ (C, one trial); prostate-related urinary symptoms (C, mixed); overactive bladder scores (D)[1][2][3]
- 400 mg/day oil capsules for hair; 1,000 mg/day extract or 10 g/day seeds or oil for urinary symptoms[1][2][3]
- None set; pumpkin seed oil is not an essential nutrient[1]
- Adverse effects did not differ from placebo in the hair trial; study products were well tolerated in the prostate trial[1][2]
- 3 graded human outcomes on this page
- October 10, 2026
How it works
ProposedPumpkin seed oil is proposed to block 5-alpha-reductase, the enzyme that converts testosterone to DHT, based on rat studies cited by the hair-trial authors. The cited human trials did not measure DHT, so the mechanism is unconfirmed.[1]
What the human research says
Human trials only, one row per outcome. The form column shows what each trial actually tested. Grades follow our evidence-grading policy.
At a glance: strongest evidence per outcome
| Outcome | Grade | Effect | Strongest evidence | Rows |
|---|---|---|---|---|
| Urinary | Grade C | Mixed | RCT · n = 1,431 · 2015 | 2 rows |
| Hair | Grade C | Improved | RCT · n = 76 · 2014 | 1 row |
Every graded row
| Outcome | Effect | Grade | Best evidence | PMID |
|---|---|---|---|---|
| Prostate-related urinary symptoms | Mixed | Grade C | RCT · n = 1,431 · 2015 Men aged 50–80 with lower urinary tract symptoms suggestive of BPH Form: whole pumpkin seed (5 g twice daily) or pumpkin seed extract capsules (500 mg twice daily) · Dose: 10 g/day seed or 1,000 mg/day extract · Duration: 12 months Response rate (IPSS drop of 5+ points) with the extract did not differ from placebo. Whole seed: 58.5% responders vs 47.3% on placebo, a difference the authors called descriptively significant and in need of confirmation. | 25196580 (opens PubMed)Source [2] |
| Hair count in male pattern hair loss | Improved | Grade C | RCT · n = 76 · 2014 Korean men with mild to moderate androgenetic alopecia Form: pumpkin seed oil capsules · Dose: 400 mg/day · Duration: 24 weeks Mean hair count rose 40% with pumpkin seed oil vs 10% with placebo; self-rated improvement and satisfaction were higher. Adverse effects did not differ. | 24864154 (opens PubMed)Source [1] |
| Overactive bladder symptom score | Improved | Grade D | Open-label trial · n = 45 · 2014 Adults with overactive bladder Form: Cucurbita maxima seed oil · Dose: 10 g oil/day · Duration: 12 weeks Overactive bladder symptom scores fell from baseline at 6 and 12 weeks. | 24872936 (opens PubMed)Source [3] |
Forms
| Form | Elemental % | Absorption (human data) | GI tolerance | Studied for |
|---|---|---|---|---|
| Pumpkin seed oil softgels | Varies[1] | No human absorption data in our sources.[1] | Adverse effects similar to placebo over 24 weeks at 400 mg/day.[1] | Hair thinning |
| Pumpkin seed extract capsules | Varies[2] | No human absorption data in our sources.[2] | Well tolerated over 12 months.[2] | Prostate-related urinary symptoms |
| Whole pumpkin seeds | Varies[2] | Food form; 10 g/day was tested in the 12-month prostate trial.[2] | Well tolerated over 12 months.[2] | Prostate-related urinary symptoms |
| Topical pumpkin seed oil | Varies[4] | Applied to the scalp; one 3-month trial compared it with minoxidil 5% foam in women with pattern hair loss, without a placebo group.[4] | Not detailed in the abstract.[4] | Female pattern hair loss (topical, not a supplement) |
Studied doses
Doses studied in human trials ranged from 400 mg/day of oil (hair trial) to 1,000 mg/day of extract and 10 g/day of seed or oil (urinary trials), for 12 weeks to 12 months.[1][2][3]
Interactions
Published interactions only: each row cites a source. No row means none was found in our sources, not that a combination is safe.
None found in our sources.
Who should be careful
- Medicines
- No published drug interactions were found in our sources. That is an absence of data, not proof of safety with every medicine.[1][2]
- Urinary symptoms
- Urinary symptoms can have causes other than benign prostate enlargement. The extract was no better than placebo in the largest trial, so get new or worsening symptoms checked.[2]
- Pregnancy and breastfeeding
- No pregnancy or breastfeeding safety data for pumpkin seed oil supplements in our sources; normal food amounts of seeds are a different exposure.[1]
- Seed allergy
- People allergic to pumpkin or other seeds should avoid it; our sources did not report allergy data.[1]
Talk to your pharmacist or clinician before starting a supplement, especially if you take prescription medicines.
How to read the label
- Label dose vs clinical doseThe hair trial used 400 mg/day of a multi-ingredient product. The urinary trials used far more: 1,000 mg/day of extract or 10 g/day of seed or oil.[1][2][3]
- Oil, extract and seed are different productsThe GRANU trial found whole seed did better than placebo while the extract did not, so a result for one form does not carry over to another.[2]
- Check the full ingredient listHair and prostate blends often add saw palmetto or other herbs; results for a blend cannot be credited to pumpkin seed oil.[1]
Cost per studied dose, without the sales pitch
Compare any product you already have by the amount it delivers, not by capsule count or front-of-pack weight.
Cost per studied dose
Enter the price, servings and the amount per serving from your label.
Frequently asked questions
Does pumpkin seed oil regrow hair?
One 24-week trial in 76 men found hair counts rose 40% vs 10% with placebo at 400 mg/day. The capsule contained other ingredients too, and the result has not been replicated, so the result is preliminary.[1]
How much pumpkin seed oil was used for hair?
400 mg/day for 24 weeks in the oral trial. A separate trial applied the oil to the scalp.[1][4]
Does pumpkin seed help an enlarged prostate?
In a 12-month trial of 1,431 men, the extract was no better than placebo. Whole seeds (10 g/day) showed more responders than placebo, but the authors said this needs confirming.[2]
Is pumpkin seed oil as good as minoxidil?
One 3-month trial in women compared topical pumpkin seed oil with minoxidil 5% foam and found both improved some hair measures. It had no placebo group and tested scalp use, not capsules.[4]
Is pumpkin seed oil safe?
Side effects did not differ from placebo over 24 weeks, and products were well tolerated over 12 months in the prostate trial.[1][2]
Can pumpkin seed oil help with overactive bladder?
One uncontrolled 12-week study of 45 people found symptom scores fell on 10 g/day of oil. Without a placebo group, that is weak evidence.[3]
Sources
- [1]Effect of pumpkin seed oil on hair growth in men with androgenetic alopecia: a randomized, double-blind, placebo-controlled trial.. Evid Based Complement Alternat Med, 2014. RCT
- [2]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.. Urol Int, 2015. RCT
- [3]Pumpkin Seed Oil Extracted From Cucurbita maxima Improves Urinary Disorder in Human Overactive Bladder.. J Tradit Complement Med, 2014. open-label
- [4]Pumpkin seed oil vs. minoxidil 5% topical foam for the treatment of female pattern hair loss: A randomized comparative trial.. J Cosmet Dermatol, 2021. RCT
What changed
- First draft. Every PMID checked against NCBI E-utilities esummary (title and year taken from the record) and abstracts read for the cited rows.
- Adversarial review pass: every claim re-checked against the cited abstract (or full text where noted), PMIDs re-verified via NCBI esummary, unsupported label-market statements removed, two evidence rows with unreported pooled n removed. Page set indexable.