A prostaglandin drug approved only for eyelashes (Latisse) and glaucoma. Scalp use is off-label and unproven; in phase 2 trials it grew fewer hairs than minoxidil 5%. It can permanently darken the iris.
Cell-derived vesicles sold by some clinics for hair loss. Experimental, not FDA-approved, with little human evidence.
mTOR regulator and immunosuppressant used more recently for anti-aging and hair regrowth
Cosmetic ingredient with small, mostly company-run trials showing thicker hairs.
much-hyped research compound targeting prolactin receptor in scalp