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Relative contraindications requiring caution include active or suspected cancer (GHK-Cu promotes angiogenesis with concern about theoretically feeding tumors, though conflicting data shows documented anti-cancer gene expression effects requiring medical supervision), severe organ dysfunction (kidney or liver failure may slow peptide clearance), hemochromatosis or copper overload conditions, autoimmune disorders, and patients on immunosuppressants or blood thinners
Due to allergic reactions, the injection site or other parts of the body may experience redness, swelling, itching, or hives
What that means for buyers: the window for purchasing injectable peptides from anonymous "research use only" websites, reconstituting them yourself, and hoping the purity matches the label is rapidly closing
doi: 10.1007/s10457-010-9299-6 90 LeroyN.TombeurF.WalgraffeY.CornlisJ
Assessment of the in vitro inhibitory activity of specific probiotic bacteria against different Escherichia coli strains