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      learn Osteopontin

      signaling protein that, when suppressed, may grow hair by reducing inflammation and stem cell loss

      learn Exosomes

      Microscopic delivery system that sends growth-promoting signals to hair follicles

      learn Cetirizine

      • How does cetirizine reduce inflammation linked to hair loss? Cetirizine is proposed to lower prostaglandin D2 and raise prostaglandin E2 around hair follicles; three small trials of a compounded 1% topical report modest increases in hair density and shaft thickness, with minoxidil doing better head-to-head. Topical cetirizine is off-label and unapproved for hair loss, and the evidence is too thin to call it effective or safe.