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They must be injected because the skin barrier blocks large peptide structures like GLP-1 analogues
GHK-Cu topical: 1 %3 % for skin, 0.5 % for scalp AHK-Cu topical: 0.05 %0.1 % is standard in most hair serums - note this is much lower than GHK-Cu percentages Injectable AHK-Cu: less well characterised
What is gastroparesis, and how serious is it
Similarities: Both melanotan 1 and melanotan 2 appear to darken the skin when administered to test subjects
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