Some websites sell GHK-Cu as a research chemical, some skincare brands sell it as a cosmetic ingredient, and some medical providers prescribe compounded topical formulas for skin and hair goals
This is typically not clinically meaningful for weekly GLP-1 protocols, but if you track symptoms carefully and notice differences in timing of side effects or appetite suppression between sites, switching entirely to one site may provide more consistent results
If you have a prior history of stomach, and/or gallbladder issues, my experience may be helpful for you to read
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Early-stage visual processing deficits in schizophrenia
Ann Thorac Surg 82(6):1982-7