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    1. KY19382 Experimental compound that activates hair-growth signals, tested only in animals
    2. GHK-Cu Copper peptide used in skin and hair cosmetics
    3. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    4. Peppermint herb and oil thought to stimulate skin and hair
    5. Hydrocortisone Mild corticosteroid used on the skin and scalp