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For oral GHK-Cu, the bioavailability is generally lower than with injections or IV administration because digestive enzymes and stomach acid break down peptides
Effect of ageing and diabetes on glucose-dependent insulinotropic polypeptide and dipeptidyl peptidase IV responses to oral glucose
Warm vial: Allow vial to reach room temperature (or roll gently between palms) to reduce injection discomfort [6]
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