ghk-cu peptide skin hair wound healing is not an overnight transformation peptide., It is a repair-support peptide., GHK copper may support collagen production, healing, antioxidant activity, inflammation control, skin barrier QUBIT GHK-Cu Copper Peptide, Support
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But others think that, for all its flaws, the FDAs drug approval system is among the best in the world

ACS Med Chem Lett 7(1):5661

Cyanocobalamin is the most common form of cobalamins used in nutritional supplements and fortified foods

GHK-Cu has a very mild side effect profile

Without controlled body composition measurements, it's hard to interpret anecdotal reports