doi: 10.3390/POLYM14040735 127 NilssonA
Wang, L., Shi, H., Zhang, X., Zhang, X., Liu, Y., Kang, W
Under this definition, both retatrutide and GHK-Cu when used for systemic or therapeutic purposes are likely to fall within the scope of medicines regulation, even if marketed as 'research chemicals' or 'cosmetic peptides' (MHRA: Guidance on borderline products)
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Anyone weighing the two routes for skin purposes should understand that they are comparing a modestly-supported cosmetic route against an unproven, higher-consideration systemic one and should treat any source that presents injection as the superior skin route as getting ahead of the science