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