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Naturally occurring plasma levels of GHK were confirmed to decline from approximately 200 g/L at age 2025 to 80 g/L by age 6080, coinciding with reduced regenerative capacity

First, all the rats were anesthetized via an intraperitoneal injection of 2% pentobarbital sodium (75 mg/kg), and the hair of the right posterior leg was removed

Ferroptosis: An iron-dependent form of nonapoptotic cell death

Consequently, FcRn rescues both albumin and IgG from intracellular lysosomal degradation, which explains their long plasma half-lives and high abundance in plasma