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minoxidil, 1993: A small double-blind trial found that a topical GHK-Cu solution produced hair density improvements comparable to 5% minoxidil over 6 months in men with androgenetic alopecia

The expression of proteins filaggrin (FLG) and loricrin (LOR) was evaluated by immunofluorescence, while the expression of mRNAs FLG and LOR in the skin was measured via qRT-PCR

That's a fancy way of saying it's three amino acids bound to a copper ion

The dosing ramps up across the first cycle: Days 1 through 15: 4 units (1 mg/day) Days 16 through 30: 8 units (2 mg/day) After 30 days, patients take 30 days off before starting the next cycle