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The ratio of review articles to original studies is something like two to one in 2026
Glutathione (GSH) is a tripeptide composed of three amino acids glycine, cysteine, and glutamic acid that functions as the body's primary intracellular antioxidant
This figure comes from studies on plasma peptide turnover rather than from a large dedicated GHK-Cu pharmacokinetic RCT, so treat it as an estimate with meaningful uncertainty
Statistical analyses used are specified in the legend of each figure
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