ghk-cu naturally occurring in human plasma levels decline with age The potential of GHK as an anti-aging peptide | Dou GHK-Cu for Hair Growth: Protocols
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Loose skin on the stomach can be caused by Aging, Weight Fluctuations, and Pregnancy

Appl Environ Microbiol (2008) 106:17181

GHK-Cu stimulates fibroblast activity, collagen production, and improves skin elasticity

Something similar happens with ghrelin [170, 187], although the pituitary ghrelin receptor does not decline with aging and the GH response to ghrelin is still seen in the elderly and there is an age-related decline [188]
