Search interest in pumpkin seed oil for hair growth has exploded over the past few years — and unlike many hair trends, this one actually has published human research behind it. In this guide we break down what pumpkin seed oil is, what the studies found, where the evidence is still thin, and how people typically use it.
What is pumpkin seed oil?
Pumpkin seed oil is the cold-pressed oil of pumpkin seeds (Cucurbita pepo). It is naturally rich in nutrients that are closely tied to normal, healthy hair, including:
- Zinc — which contributes to the maintenance of normal hair
- Vitamin E — an antioxidant that helps protect cells from oxidative stress
- Phytosterols — plant compounds researchers are particularly interested in for hair
- Omega fatty acids — including linoleic and oleic acid
Why do people take it for hair?
Hair thinning in both men and women is often linked to dihydrotestosterone (DHT), a hormone that can gradually shrink sensitive hair follicles. Researchers theorise that the phytosterols in pumpkin seed oil may influence the enzyme (5-alpha-reductase) that converts testosterone into DHT. It is important to say this mechanism has not been definitively proven in large human trials — but it is the main scientific rationale behind pumpkin seed oil's popularity.
The 2014 trial: 40% more hair count
The best-known evidence is a randomised, double-blind, placebo-controlled trial published in Evidence-Based Complementary and Alternative Medicine (Cho et al., 2014). Here is what happened:
- 76 men with mild-to-moderate pattern hair thinning took part
- Half received 400 mg of pumpkin seed oil per day in capsules, half received a placebo
- The study ran for 24 weeks
At the end, the pumpkin seed oil group recorded a 40% mean increase in hair count, versus 10% in the placebo group. Blinded investigators also rated their photographs as more improved, self-rated satisfaction was higher, and reported side effects were no different from placebo.
The honest caveats
Good SEO articles tell you what the marketing ones leave out, so here it is: the trial was relatively small, ran for six months, and only included men. A published comment on the study also noted the capsules contained small amounts of other ingredients alongside pumpkin seed oil, so the oil may not deserve 100% of the credit. More independent research would be welcome.
What about topical pumpkin seed oil?
A 2019 laboratory study found topical pumpkin seed oil promoted hair growth in mice, but human evidence for applying the oil directly to the scalp is still limited. Notably, the strongest human data we have used an oral supplement — which is one reason capsules are the most popular format (no greasy scalp, no staining, consistent dose).
How people use it
- Daily and consistently — with food and a glass of water
- For at least 12–24 weeks — the 2014 trial measured results at 24 weeks; hair simply grows slowly (see our guide on how long pumpkin seed oil takes to work)
- Often combined with saw palmetto — another studied botanical; see our pumpkin seed oil vs saw palmetto comparison
Frequently asked questions
Does pumpkin seed oil block DHT?
That is the leading theory, based on its phytosterol content, but it has not been conclusively demonstrated in humans. What the human trial measured was the outcome — hair count — rather than the mechanism.
Is pumpkin seed oil safe?
In the 2014 trial, adverse effects were no different from placebo. As with any food supplement: do not exceed the stated dose, avoid it if you are pregnant or breastfeeding, and speak to your GP or pharmacist first if you have a medical condition or take medication.
Capsules or oil — which should I choose?
The human evidence used oral capsules, and they are far easier to take consistently. Consistency is what matters most.
The bottom line
Pumpkin seed oil is one of the few natural hair ingredients with a placebo-controlled human trial behind it — with genuinely encouraging results — but the research base is still young. If you want to try it, give it a fair run of 12–24 weeks.
Ready to start? HerbiCure Pumpkin Seed Oil & Saw Palmetto Capsules (300 softgels) combine both botanicals in one daily softgel, or learn more on our pumpkin seed oil for hair page.
This article is for information only and is not medical advice. Food supplements are not intended to diagnose, treat, cure or prevent any disease. If you are concerned about hair loss, speak to your GP — sudden or patchy hair loss should always be checked by a professional.