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GHK (glycyl-L-histidyl-L-lysine) naturally occurs in human plasma at approximately 200 ng/mL in young adults, declining with age 14
PLoS ONE 8:e66639 Kim JH, Jin S, Eo H, Oh MS, Lim Y (2023) Two faces of catechol-O-methyltransferase inhibitor on one-carbon metabolism in Parkinsons disease: a meta-analysis
Hematology Reports 5 (1), 2333
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