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MEResearchers at the University of California, Los Angeles, have identified a small molecule called PP405 that can activate hair follicle stem cells and restart natural hair growth cycles. The compound works by inhibiting a protein that keeps these stem cells in a dormant, or quiescent, state. By switching this signal off, the cells are reactivated and begin producing new hair. Unlike conventional treatments that mainly target hormones, this approach focuses on the follicle’s underlying metabolic activity.
The mechanism behind the discovery centers on stimulating glycolytic metabolism within the stem cells. This process increases lactate production, which researchers found acts as a metabolic trigger that pushes follicles from a resting phase into an active growth phase. By supplying the necessary cellular energy, this method accelerates the hair cycle more rapidly than existing FDA-approved treatments.
In early laboratory studies and initial human trials, participants using a topical form of PP405 reported visible results in a very short period. Some subjects experienced the growth of new, thick terminal hair rather than fine fuzz within as little as one week of daily application. This unusually fast response has drawn attention to the treatment as a potential alternative to current hair loss medications.
PP405 is designed to be applied as a topical gel, limiting absorption into the bloodstream and reducing the risk of systemic side effects. By targeting hair follicles directly at the cellular level, it could offer a non-invasive alternative to surgical hair transplants or long-term hormone-based therapies. The startup Pelage Pharmaceuticals, founded by the UCLA research team, is now advancing the compound through larger clinical trials.
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