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As you age, the glutathione levels in your body begin to decrease

Reported Results: Biological Age As of 2025/2026, Johnson reports a biological age more than five years younger than his chronological age, based on multiple biological age clocks including DNA methylation and pace-of-aging metrics

Sweatt JD (2009)

The name reflects the three amino acids that form the peptide structure: Glycine Histidine Lysine Although GHK itself is biologically active, its most studied and therapeutically relevant form is GHK-Cu, which is formed when the peptide binds with a copper ion

Bonfiglio MF, Traeger SM, Hulisz DT, Martin BR

The study was performed by the Department of Integrative Medicine and Nutritional Sciences, as well as the Departments of Neurology and Radiology, at Thomas Jefferson University