Quick answer: In a randomized, double-blind trial of 76 men with mild to moderate androgenetic alopecia, 400 mg of pumpkin seed oil a day for 24 weeks raised average hair count by 40%, versus 10% on placebo, with no difference in side effects between the groups. Pumpkin seed oil is thought to work by blocking 5α-reductase, the enzyme that makes DHT, which puts it among the best-supported natural DHT blockers.
The pumpkin seed oil hair trial, in detail
The key study is Cho and colleagues, 2014 (PMID 24864154).
| Pumpkin seed oil | Placebo | |
|---|---|---|
| Participants | 76 men with mild to moderate male pattern hair loss | |
| Dose and length | 400 mg a day, 24 weeks | Placebo, 24 weeks |
| Average hair count change | +40% | +10% |
| Self-rated improvement and satisfaction | Significantly higher | Lower |
| Side effects | No difference between groups | |
Hair growth was assessed four ways: blinded review of standardized photos, self-assessment, hair thickness and hair counts. That multi-angle design, plus the placebo control, is why this trial carries weight. It's still one study, and larger trials would strengthen the case.
How pumpkin seed oil works as a DHT blocker
Pumpkin seed oil (Cucurbita pepo) is rich in phytosterols and antioxidants. In earlier animal research it blocked 5α-reductase and showed anti-androgen effects, the rationale the trial authors give for testing it on hair. Less DHT at the follicle means less miniaturization, the gradual shrinking that thins the temples and crown. Read more in DHT, Explained.
Capsules or topical oil?
The trial used capsules. Applying pumpkin seed oil to the scalp puts it where pattern hair loss happens and pairs naturally with other topical actives. A 2025 review of investigator-blinded trials of non-prescription hair loss options, led by a University of Toronto dermatologist, included pumpkin seed oil among the options showing improvements with minimal side effects (Gupta 2025).
Pumpkin seed oil and saw palmetto: better together
Pumpkin seed oil and saw palmetto are the two natural DHT blockers with the strongest human evidence. Using them together covers both well-studied options in one routine. Add rosemary oil, which matched minoxidil 2% in a six-month trial, and you address DHT and scalp support at the same time.
That's the formula behind DHT Defense Hair Oil: pumpkin seed oil, saw palmetto, rosemary and bhringraj in a light grapeseed base, made in Toronto and applied straight to the root.
How to use pumpkin seed oil for hair loss
- Photograph your scalp on day one: same light, same angle.
- Apply daily to thinning areas and massage for about a minute. Leave it in.
- Stay consistent. The trial ran 24 weeks; check in at week 8 and judge at week 16 or later.
- Patch test first if you have seed or plant allergies.
Frequently asked questions
Is pumpkin seed oil a DHT blocker?
It's considered a natural DHT blocker: research shows it blocks 5α-reductase, the enzyme that converts testosterone into DHT.
How long does pumpkin seed oil take to work?
The trial measured results at 24 weeks. Give it at least 16 weeks of daily use before assessing.
Can I put pumpkin seed oil directly on my scalp?
Yes. It's a gentle, light oil. Patch test first and apply to the scalp rather than the lengths of your hair.
Is pumpkin seed oil better than saw palmetto?
They're complementary. Pumpkin seed oil has the stronger single placebo-controlled trial; saw palmetto has the larger body of research. Many men use both.
Related reading
References
- Cho YH, et al. 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;2014:549721. PMID 24864154
- Gupta AK, et al. Do non-prescription products help in managing androgenic alopecia? Skin Appendage Disord. 2025. PMID 40475103