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[DOI] [PMC free article] [PubMed] [Google Scholar] 43.Chang C.H., Tsai W.C., Lin M.S., Hsu Y.H., Pang J.H.S

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Subsequent work established that the same sequence exists in human plasma, saliva, and urine at concentrations that decline with age, and that the sequence is found as a subfragment of the alpha-2 chain of type I collagen, which means GHK is released into the tissue environment when collagen breaks down

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doi: 10.1073/pnas.0605478103 132 DasPLahiriALahiriASenMIyerNKapoorNet al

Full regulatory status, mechanism comparison to tesamorelin, and GHRP selectivity data