Quick answer: Yes, DHT plays a role in women's hair loss, and two natural DHT blockers have been tested in women. Pumpkin seed oil applied to the scalp improved female pattern hair loss in a trial against minoxidil 5% foam, and saw palmetto increased hair count and density in menopausal women in a placebo-controlled trial. Both inhibit 5α-reductase, the enzyme that makes DHT. They're not for use during pregnancy or breastfeeding.
Does DHT cause hair loss in women?
Women produce testosterone too, in smaller amounts, and the enzyme 5α-reductase converts some of it into DHT. In genetically sensitive follicles on the top of the head, DHT gradually shrinks them, which shows up as a widening part and thinner hair: female pattern hair loss.
Two life stages make this more likely:
- Menopause. Falling estrogen shifts the hormonal balance toward androgens. More than half of postmenopausal women experience hair loss (Leavitt 2025).
- PCOS. Polycystic ovary syndrome raises androgen levels; in one study, 42.5% of women with PCOS had androgenetic alopecia (Abusailik 2021).
Natural DHT blockers studied in women
| Ingredient | How it's thought to work | Evidence in women |
|---|---|---|
| Pumpkin seed oil | Inhibits 5α-reductase | Topical oil vs minoxidil 5% foam, 60 women, 3 months: both improved; pumpkin seed oil reduced fine vellus hairs and increased regrowing hairs (Ibrahim 2021) |
| Saw palmetto | Inhibits both types of 5α-reductase | 6-month placebo-controlled trial, half the participants women: menopausal women gained terminal hair count and density versus placebo, with no treatment-related side effects (Ablon 2026) |
| Rosemary oil | Supports scalp circulation | Main trial was in men, where it matched minoxidil 2%; widely used by women as a scalp oil |
A 2025 review of female hair loss highlighted saw palmetto and pumpkin seed oil as promising non-pharmaceutical options because both inhibit 5α-reductase and may reduce follicle miniaturization (Leavitt 2025).
How do they compare with standard treatments?
- Minoxidil is the most studied treatment for women. A Cochrane review of 47 trials found it effective, with no difference between 2% and 5% (van Zuuren 2016). It doesn't block DHT, so it pairs well with a DHT blocker.
- Finasteride was no more effective than placebo in women in the same review, and it isn't used by women who are or may become pregnant.
- Spironolactone and other anti-androgens are prescribed off-label by doctors, especially for PCOS.
Who should not use DHT blockers
Because DHT blockers act on hormones, don't use them if you're pregnant, trying to conceive or breastfeeding. Saw palmetto may be unsafe during pregnancy and breastfeeding (NCCIH). If you take hormonal birth control or hormone therapy, check with your doctor or pharmacist first.
Postpartum shedding is usually temporary telogen effluvium rather than pattern hair loss, and it typically settles on its own within months.
How to use a natural DHT blocker for thinning hair
- Photograph your part in the same light and spot.
- Apply along the part and crown daily and massage for about a minute.
- Use a light oil so it doesn't weigh down longer hair, or apply before washing.
- Check your iron and vitamin D with your doctor; low levels make thinning worse.
DHT Defense Hair Oil combines pumpkin seed oil and saw palmetto with rosemary and bhringraj in a light grapeseed base that absorbs fast. Made in Toronto, no prescription.
Frequently asked questions
Do women need a DHT blocker?
If your thinning is gradual, on top of the head and along the part, DHT is likely involved, especially after menopause or with PCOS. A DHT blocker targets that cause.
Is saw palmetto safe for women?
It was well tolerated in a trial that included menopausal women. Avoid it if you're pregnant, trying to conceive or breastfeeding.
Does pumpkin seed oil work for women's hair loss?
In a trial of 60 women with female pattern hair loss, topical pumpkin seed oil improved hair alongside a minoxidil 5% foam comparison group.
Can I use a DHT blocker with minoxidil?
Yes. They work on different pathways. Ask your pharmacist if you're unsure.
Will a DHT blocker cause facial hair?
No. Unwanted facial hair in women is driven by androgens such as DHT, so lowering DHT works in the opposite direction. The trials above reported no treatment-related side effects. Patch test any topical first.
Related reading
- Female pattern hair loss: causes, signs and treatment
- Natural DHT blockers for hair loss
- DHT, Explained: the full guide
References
- Ibrahim IM, et al. Pumpkin seed oil vs. minoxidil 5% topical foam for the treatment of female pattern hair loss: a randomized comparative trial. J Cosmet Dermatol. 2021. PMID 33544448
- Ablon G. The safety and efficacy of a novel saw palmetto (Serenoa repens) extract for promoting hair growth in adults with self-perceived thinning hair: 180-day results. J Cosmet Dermatol. 2026. PMID 41652806
- Leavitt A, et al. Addressing the root causes of female hair loss and non-pharmaceutical interventions. J Drugs Dermatol. 2025. PMID 40627570
- Abusailik MA, et al. Cutaneous manifestation of polycystic ovary syndrome. Dermatol Reports. 2021. PMID 34659671
- van Zuuren EJ, et al. Interventions for female pattern hair loss. Cochrane Database Syst Rev. 2016. PMID 27225981
- National Center for Complementary and Integrative Health. Saw palmetto. nccih.nih.gov