GHKs value is partly that it holds copper in a form that is bioavailable yet less prone to indiscriminate oxidative chemistry
This was first suggested for the GLP-1R agonists exendin-4 and liraglutide when it was shown that the suppression of food intake that they cause upon systemic administration is prevented or attenuated when the GLP-1R antagonist exendin-9 is centrally administered in rats [7] and when central GLP-1Rs are deleted in mice [8]
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Do not use a preparation that has been frozen or that you suspect may have been frozen, and do not attempt to re-refrigerate a thawed product
Semaglutide, like Tirzepatide, was initially conceived as a treatment for type 2 diabetes