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    1. Finasteride Popular 5-alpha reductase inhibitor that lowers DHT, taken as a pill or used topically
    2. Castor oil Thick plant oil used in hair care
    3. Thymosin Beta 4
    4. GHK-Cu Copper peptide used in skin and hair cosmetics
    5. KY19382 Experimental compound that activates hair-growth signals, tested only in animals