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[DOI] [Google Scholar] Chou I-M

The amount of GHK in a person generally decreases as they age
We're talking about Certificates of Analysis (COAs)

that is, when pharmacokinetics are linear. In this situation, when the drug is eliminated (ie, metabolized and excreted from the body), the fall in blood level is proportionate to the concentration of the drug in blood

Is GHK-Cu a Safe Option for Individuals with Acne-Prone Skin
If you suspect that you may have a vitamin B12 deficiency, it is important to talk to your healthcare provider to determine the underlying cause and to discuss appropriate treatment options
