How Much Pumpkin Seed Oil Should You Take Daily for Hair Growth Benefits?

Pumpkin seed oil, extracted from the seeds of the Cucurbita pepo plant, has been proposed as a potential support for hair growth. This oil contains compounds such as phytosterols, fatty acids, and antioxidants that have been proposed to affect hair follicles. Hair loss, especially androgenetic alopecia, is influenced by the hormone dihydrotestosterone (DHT), which binds to and weakens hair follicles over time. Some animal studies have suggested that pumpkin seed oil may inhibit the enzyme 5-alpha-reductase, which converts testosterone into DHT; this has not been measured in people. While this suggests a mechanism by which hair loss could be slowed, the evidence is still limited and warrants careful interpretation.

Research on Dosage and Effectiveness

The only published trial of pumpkin seed oil alone for hair growth is a 2014 randomized, double-blind, placebo-controlled trial by Cho et al. The study included 76 men with mild to moderate androgenetic alopecia who were given 400 mg a day of a branded pumpkin seed oil capsule (Octa Sabal Plus) for 24 weeks. The capsules were supplied by Dreamplus Co., Ltd., which also funded the study, and the trial did not measure DHT. Hair growth was evaluated using standardized scalp photographs and phototrichogram methods, showing a 40% increase in hair count for the pumpkin seed oil group compared to 10% for the placebo. Despite these promising results, the study has notable limitations: the sample size was small, only male participants were included, and self-reported satisfaction may have introduced bias. The findings do not automatically generalize to women or larger populations.

No study has compared different doses, so there is no established dose for hair. The 400 mg figure is simply the amount used in that one trial, and its long-term safety at supplement doses has not been studied.

Proposed mechanisms

The fatty acids in pumpkin seed oil, such as linoleic acid, have been proposed to support scalp health, but this has not been tested for hair. Phytosterols have been proposed as mild DHT inhibitors, potentially reducing follicle miniaturization that leads to thinning hair. Antioxidants like vitamin E have been proposed to counteract oxidative stress in hair follicles, which laboratory studies have linked to hair loss; this has not been tested with pumpkin seed oil in people. These mechanisms provide a theoretical rationale for pumpkin seed oil’s potential benefit, though hair growth is affected by many variables, including genetics, nutrition, and hormonal balance. Therefore, pumpkin seed oil alone is unlikely to produce dramatic results.

Pumpkin seeds are a common food. Concentrated supplements have little long-term safety data. Ask a pharmacist before use, especially if you take other medicines. In the Cho trial, side effects were few and similar to placebo: one man in each group reported itching, and one in the pumpkin seed oil group reported mild stomach discomfort. Long-term effects of high-dose supplementation have not been well studied, and caution is advised. Pregnant and breastfeeding individuals should consult a healthcare professional before use.

In summary, the only clinical trial available, which was small and funded by the capsule supplier, reported higher hair counts with 400 mg a day in men over 24 weeks. Its limitations include the small sample size, male-only participants, and a single branded product. Pumpkin seed oil is not an approved hair-loss treatment. Broader claims about efficacy, optimal dosage, or applicability to women are not substantiated by current research. While preliminary data suggest a potential benefit, further studies with larger, diverse populations and longer follow-up periods are required to establish efficacy and safety.

References

Cho, Y. H., Lee, S. Y., Jeong, D. W., Choi, E. J., Kim, Y. J., Lee, J. G., Yi, Y. H., & Cha, H. S. (2014). Effect of pumpkin seed oil on hair growth in men with androgenetic alopecia: A randomized, double-blind, placebo-controlled trial. Evidence-Based Complementary and Alternative Medicine, 2014, 549721. PMID 24864154. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4017725/

National Institutes of Health. (n.d.). Dietary Supplements. https://www.nih.gov/health-information/dietary-supplements

World Health Organization. (2021). Traditional, complementary, and integrative medicine. https://www.who.int/health-topics/traditional-complementary-and-integrative-medicine