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GHK-Cu (Copper Peptide) Copper is essential for the function of enzymes involved in nerve maintenance

These are compounds that: Are not FDA-approved medications they haven't gone through the clinical trial and approval process required for prescription drugs Are not DEA-scheduled controlled substances they're legal to purchase, possess, and ship within the United States Are sold under "research use only" disclaimers vendors label them as not for human consumption, regardless of how buyers actually use them Are manufactured outside the pharmaceutical supply chain produced by chemical synthesis companies rather than licensed drug manufacturers Common grey market peptides include BPC-157, TB-500, Ipamorelin, CJC-1295, GHK-Cu, KPV, Selank, and research versions of GLP-1 agonists like Retatrutide and Tirzepatide

But certain things can mess with its levels

Gremese, E

Methyl B12 then give up this methyl group to join with homocysteine to form methionine