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For facial skin improvement, topical is often sufficient

doi: 10.1016/j.atherosclerosis.2010.02.022 234
Levels drop with age, stress, alcohol, and environmental exposure
The main differences are vial sizes (semaglutide commonly comes in 5 mg and 10 mg vials) and dosing ranges (semaglutide doses run 0.25 mg to 2.4 mg, lower than tirzepatide)
Also, they promote endothelial repair through SPRED-1 inhibition via mRNA-126
Howard Maibach's group later tested the mixed copper peptide complexes using four human wound healing systems