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    1. KY19382 Experimental compound that activates hair-growth signals, tested only in animals
    2. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    3. Follistatin Protein that blocks activin, a growth-regulating signal
    4. Hair Fibers cosmetic product that temporarily makes hair appear thicker
    5. Hair Multiplication extract, clone, and reinsert your own hair cells