~ MIXEDHair
Ketoconazole Shampoo (Nizoral)
Small studies suggest a modest anti-androgenic effect on the scalp beyond its antifungal action. A useful adjunct, never a treatment.
Also called: nizoral · keto shampoo · antifungal shampoo hair
Verdict — mixed
Real in part — the claim outruns what it actually does.
Evidence grade C
Mechanistic plausibility, small studies, or observational data. Suggestive, not established.
Mechanism
Imidazole antifungal with weak local anti-androgen activity; also reduces Malassezia-driven scalp inflammation, which independently worsens shedding in seborrhoeic dermatitis.
Citations
- Ketoconazole shampoo: effect on hair density and diameter in androgenic alopeciaDermatology · 1998
The full read
The famous small study comparing 2% ketoconazole against minoxidil found comparable improvements in hair diameter, and it has never been replicated at scale — so treat it as suggestive, not established. What is solid is the seborrhoeic dermatitis half: an inflamed, flaking scalp sheds more, and controlling that helps whether or not the anti-androgen story holds. Practically, two to three washes a week with a few minutes of contact time, as a third item alongside `finasteride` and `minoxidil`. Cheap, low-risk, and not a substitute for either.
Photo: Dove shampoo bottle in black background.jpg by Ranjima np · CC0 via Wikimedia Commons.
