a synthetic estrogen used topically as an anti-androgen
- Alfatradiol: What does a form of estrogen have to do with hair loss in men? Alfatradiol (17α-estradiol) is a prescription topical hormone, licensed for androgenetic alopecia in Germany but not FDA-approved. The controlled trial evidence is in women, where it produced stabilisation rather than regrowth and was outperformed by minoxidil; no comparable placebo-controlled trial in men appears to have been published.
- Is topical cetirizine effective for androgenetic alopecia in women? Topical cetirizine is not an approved product and its use for female-pattern hair loss is off-label. The evidence is one small unblinded pilot study in mixed-sex patients and one randomized trial in 66 women where cetirizine was added to minoxidil; it is unproven on its own.