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    1. Melatonin Hormone that regulates sleep, sold as a supplement
    2. KY19382 Experimental compound that activates hair-growth signals, tested only in animals
    3. Minoxidil Vasodilator used on the scalp and, at low doses, as a tablet
    4. GHK-Cu Copper peptide used in skin and hair cosmetics
    5. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement