UCLA scientists found a molecule — PP405 — that wakes up sleeping hair follicles and tells them, “Do your job.”

Research/Science 5/12/2025

PP405 is anticipated as a future treatment for dormant hair follicles, but its effectiveness and safety are uncertain. Current treatments include oral minoxidil and microneedling, with some avoiding finasteride due to side effects.

PP405 is a promising new treatment for hair loss that activates dormant stem cells in hair follicles, potentially bypassing the effects of DHT. It is currently in phase 2 trials and could be available between 2027 and 2030, but it is not considered a definitive cure.

PP405, developed by Pelage Pharmaceuticals, can reactivate dormant hair follicle stem cells and increase hair growth by 20% in eight weeks, unlike minoxidil or finasteride. However, skepticism remains about its effectiveness and availability, with concerns about funding and the timeline for broader access.

PP405 may revive dormant hair follicles, and DHT blockers like finasteride or dutasteride could maintain new hair. Combining PP405 with minoxidil might be optimal, but long-term effects and continuous use are uncertain.

Hair follicles are mostly dormant but can be reactivated with treatments like minoxidil, finasteride, and microneedling. A new drug, PP405, shows promise for hair regrowth but may not be available until 2027-2028.