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      learn Tretinoin

      the gold standard retinoid in dermatology that's also helpful for hair regrowth alongside Minoxidil

      learn HMI-115

      much-hyped research compound targeting prolactin receptor in scalp

      learn GHK-Cu

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

      learn Caffeine

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