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GHK-Cu is a copper II-coordinated tripeptide composed of glycine, histidine, and lysine
Under physiological conditions, free glutathione is present in concentrations ranging from 1 to 10 mM with the reduced form largely predominating over the oxidized form (Gutscher et al., 2008
PMC 1183455
Many people use glutathione supplements or injections for an extended period to achieve specific health and cosmetic goals
Clinical Nutrition Open Science, 41, 100065
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