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    1. GHK-Cu Copper peptide used in skin and hair cosmetics
    2. Dutasteride 5-alpha reductase inhibitor that blocks both enzyme types, a stronger DHT blocker than finasteride
    3. Thymosin Beta 4
    4. KY19382 Experimental compound that activates hair-growth signals, tested only in animals
    5. Alfatradiol Weak form of estrogen applied to the scalp