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GHK-Cu: A tripeptide (glycyl-L-histidyl-L-lysine) capable of binding copper ions, forming a bioactive copper-peptide complex

This can include the lips, which may appear pale or whitish

Peer review Peer review information Nature Communications thanks the anonymous, reviewer(s) for their contribution to the peer review of this work

Based on available data, appetite suppression with retatrutide does not appear to diminish significantly over the treatment period studied

Learn more about our Obesity Clinic and how GLP-1s can help patients See why you should partner with a primary care provider for your health This blog was medically reviewed by endocrinologist Miranda Stiewig-Rapp.