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    1. Finasteride Popular 5-alpha reductase inhibitor that lowers DHT, taken as a pill or used topically
    2. Dutasteride 5-alpha reductase inhibitor that blocks both enzyme types, a stronger DHT blocker than finasteride
    3. GHK-Cu Copper peptide used in skin and hair cosmetics
    4. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    5. Peppermint herb and oil thought to stimulate skin and hair