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      learn Caffeine

      the stimulant you know and love can be used topically to stimulate hair

      learn Estradiol

      an estrogen promoting hair regrowth more commonly used in women

      learn Melatonin

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

      learn HMI-115

      much-hyped research compound targeting prolactin receptor in scalp

      learn Valproic acid

      an anticonvulsant repurposed for hair loss via histone inhibition