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Plasma GHK-Cu concentrations decline with age, from approximately 200 ng/mL at age 20 to under 80 ng/mL by age 60, correlating with reduced skin repair capacity

Anagen phase: The active growth phase of the hair cycle when follicles produce hair shafts

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Store lyophilized GHK-Cu refrigerated between 2C and 8C (36F to 46F), protected from direct light and moisture

500 solutions of dihexa, piroxicam, verapamil and 7-ethoxycoumarin (low, moderate and highly metabolized controls, respectively) were prepared in acetonitrile