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    1. GHK-Cu Copper peptide used in skin and hair cosmetics
    2. Baricitinib JAK inhibitor pill used for severe alopecia areata
    3. Estradiol Estrogen hormone, prescribed in tablet, patch and gel forms
    4. Caffeine Stimulant used in hair shampoos and lotions
    5. Follistatin Protein that blocks activin, a growth-regulating signal