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Topical research formulations commonly reference GHK-Cu concentrations in the range of 0.05% to 2%, with research formulations frequently using 1-2% for skin regeneration research and lower concentrations for sensitive-area research

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Polyphenols also associated with an increase in glutathione levels

permeable derivative of glutathione (GSH) that undergoes hydrolysis by intracellular esterases thereby increasing intracellular GSH concentration in many tissues and cell types