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Peer review Peer review information Nature Reviews Endocrinology thanks Thomas Lutz and the other, anonymous, reviewer(s) for their contribution to the peer review of this work

GHK-Cu (Copper Tripeptide): Barrier Rebuilder GHK-Cu is a copper-binding tripeptide (glycyl-L-histidyl-L-lysine) that occurs naturally in human plasma and drops significantly with age

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