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doi: 10.1017/S0954422419000155 226
GHK-Cus lack of side effects has been cited by multiple researchers [3, 8, 9], and it has consistently been found to be non-toxic and a non-irritant [16]
GHK exists naturally in saliva and urine as well, released from extracellular matrix proteins including SPARC and the collagen 2(I) chain during tissue injury, functioning as a matrikine damage signal that activates repair mechanisms
Research-grade materials serve as experimental substances and dont meet the same rigorous purity standards required for pharmaceutical-grade compounds
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