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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. Follistatin Protein that blocks activin, a growth-regulating signal
    4. Cyproterone a synthetic anti-androgen and weak progestogen that inhibits DHT binding to androgen receptor
    5. Alopecia Areata autoimmune disorder causing patchy hair loss