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Others get inside the cell and play a more direct role in the chemistry

Cells Tissues Organs 194 (1), 2537

The copper coordination chemistry of GHK-Cu enables controlled cellular copper delivery while preventing the formation of reactive oxygen species characteristic of free copper toxicity, with the peptide's binding affinity (log K = 16.1) positioning it perfectly within the physiological copper transport hierarchy to facilitate controlled metal transfer to enzymatic targets including lysyl oxidase (essential for collagen cross-linking) and superoxide dismutase (critical for antioxidant defense)

The combination pairs the most potent fat-loss peptide currently in clinical development with one of the most extensively studied regenerative peptides in the research literature

Cureus 12 , e10796 (2020)

While B12 is naturally found in animal products like meat, dairy, and eggs, many people struggle to get enough from diet alone