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This is a set of standards that ensures products are consistently produced and controlled

GHK-Cu is present in human plasma at approximately 200 ng/mL (roughly 500 nM) in young adults around age 20, declining to approximately 80 ng/mL (roughly 200 nM) by age 60, representing a 60% reduction over four decades

doi: 10.3389/fphar.2021.699245 Received 23 April 2021 Accepted 09 June 2021 Published 14 July 2021 Volume 12 - 2021 Edited by Hua Jin, Guangdong Medical University, China Reviewed by Juanzhu Yan, University of North Carolina at Chapel Hill, United States Antoine Dufour, University of Calgary, Canada Updates Copyright 2021 Li, Su, Cai and Liu