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Age-Related Decline In the body, GHK-Cu naturally occurs at concentrations of approximately 200 ng/mL in plasma at age 20, but these levels decline progressively with age to less than 80 ng/mL by age 60 - this age-related decline correlates with decreased tissue repair capacity, skin aging, and impaired regenerative responses, leading to the hypothesis that GHK-Cu decline contributes to aging phenotypes and that restoration of youthful levels through supplementation could have anti-aging benefits

doi: 10.1186/s12868-015-0149-3

Compared to classical gastroprotective peptides such as sucralfate or proton pump inhibitors (PPIs), it acts via a completely different pathway: restoration of mucosal microcirculation rather than acid reduction or formation of a mechanical protective layer

Plasma ketone and medium chain fatty acid response in humans consuming different medium chain triglycerides during a metabolic study day

This established GHK-Cus place in the skin regeneration research hierarchy