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GHK-Cu has an excellent safety profile backed by over 50 years of research and more than 70 published studies

Classification and clinical features of adverse drug reactions in patients with ulcerative colitis treated with 5-aminosalicylate acid: a single-center, observational study

doi:10.1007/s00441-019-03016-8 Janvier S, Cheyns K, Canfyn M, et al

After the first puncture, Reconstitution Solution should be refrigerated and used within 30 days to maintain sterility and peptide integrity.[20][21] Peptides stored in Reconstitution Solution remain stable for 30 days when refrigerated and can be aliquoted for extended research periods