Pumpkin seed oil for hair: the one clinical trial, what it means, and what it does not

What pumpkin seed oil is

Pumpkin seed oil is cold-pressed from the seeds of Cucurbita pepo. It is a green, nutty oil rich in linoleic and oleic acids, tocopherols (vitamin E), phytosterols and zinc. In cosmetics it is an emollient: it spreads easily, absorbs reasonably fast and feels lighter than black seed or castor oil.

Why people search for it

Because of one study. A 2014 randomised trial in Korea put pumpkin seed oil on the map as a “natural 5-alpha-reductase blocker”, and that phrase travelled far. The questions people ask now are how to use it, when it starts working, what its downsides are and whether it treats hereditary hair loss.

What the research actually shows

Randomized trial, oral · Cho and colleagues gave 76 men with mild to moderate androgenetic alopecia either 400 mg of pumpkin seed oil a day in capsules or a placebo for 24 weeks. The oil group’s mean hair count rose by about 40%; the placebo group’s by about 10%. Self-rated improvement and satisfaction were also higher, and adverse effects did not differ.

Limits · It is a single trial of oral supplementation in men, and a published comment on it questioned the design and the strength of the conclusion. A 2025 network meta-analysis of dietary supplements for androgenetic alopecia pooled the oral evidence; it did not find a basis for topical claims because there are no topical trials.

Mechanism, hypothesis · The proposed mechanism is inhibition of 5-alpha-reductase by phytosterols, shown in animal and laboratory work. Whether a scalp oil delivers enough of those compounds to matter is unknown.

Known · Pumpkin seed oil is a safe, well-tolerated cosmetic oil. Its practical value in a scalp blend is texture: lightness and spread.

How pumpkin seed oil is used on hair

• As an oral supplement: that is what the trial tested. Talk to a doctor before taking supplements; a scalp oil is not a substitute.
• As a scalp oil: massaged into the scalp as a conditioning oil, alone or in a blend.
• In Afghani Oil: cold-pressed pumpkin seed is the light carrier that keeps the blend from feeling heavy. Apply a measured amount at the parting with the dropper and follow the directions supplied with the bottle, as in how to use Afghani Oil.

Downsides to know

The oil oxidises faster than more saturated oils, so it should be kept closed and away from heat and light. Allergy is rare but, as with any seed oil, possible; patch test first.

How it fits with the other four botanicals

Pumpkin seed is the texture of the blend. Rosemary brings the strongest topical trial, saw palmetto the antiandrogenic research, black seed the traditional scalp use and amla the shine and laboratory results. The ingredients guide lists all five.

Common questions

When does pumpkin seed oil start working? The oral trial measured at 24 weeks. There is no timeline for the topical oil because there is no topical trial.

Does pumpkin seed oil treat hereditary hair loss? One oral trial in men suggests a benefit; that is not enough to call it a treatment, and the scalp oil has not been tested. See a dermatologist if you are losing hair.

Is it the same as pumpkin oil? Yes in cosmetics; both names refer to the seed oil.

Where pumpkin seed sits in Afghani Oil

Pumpkin seed is the second of the five botanicals printed on the label of the Original Afghani Oil, 50 ml: light on the hair, chosen to help carry the blend without weighing hair down.

Sources

1. 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.
2. Comment on “Effect of pumpkin seed oil on hair growth in men with androgenetic alopecia”. Evid Based Complement Alternat Med. 2015. PMID 25918542.
3. Effects of dietary supplements on androgenetic alopecia: a systematic review and network meta-analysis. Front Nutr. 2025. PMID 41561175.