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The peptide is endogenously present in human plasma at low nanomolar concentrations in young adults, with the concentration declining with age (a finding from the original GHK research literature that is frequently cited in discussions of the compound)

10.1016/j.foodchem.2013.02.104 12 AnnaC.-A.LdiaC.VctorP.MayteB.MontserratP.Mara-JosM.et al (2012)

The majority of AEs were gastrointestinal, they were typically of mild to moderate severity, they were associated with dose escalation and were more present in the rapid dose escalation groups [30]

That's certainly where it's been studied in animal studies

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The breakdown of collagen typically corresponds with the disintegration of collagen fibers, often occurring due to tissue damage