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Despite central obesity and increased liver fat, they are insulin sensitive, partially protected from cancer, and present a major reduction in pro-aging signaling and perhaps increased longevity (42)

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Central role of P53 in the suntan response and pathologic hyperpigmentation

Unlike fully synthetic peptides, GHK is considered endogenous, though its broader biological functions continue to be actively investigated

Found endogenously in human plasma (~200 ng/mL at age 20), saliva, and urine, GHK-Cu forms a high-affinity complex with copper(II) ions through its histidine imidazole nitrogen and peptide backbone coordination