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      learn Melatonin

      hormone commonly taken for sleep aid has some topical benefits for hair

      learn GHK-Cu

      a copper peptide showing promise in both regrowth and reversing gray hair

      learn Estradiol

      an estrogen promoting hair regrowth more commonly used in women

      learn Follistatin

      glycoprotein that inhibits TGF-β and promotes hair growth by antagonizing activin

      learn Dexpanthenol

      precursor of vitamin B5 with hair stimulating effects