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Copper Chelation and Delivery At the most fundamental level, GHK functions as a copper chelator and delivery system - the tripeptide binds Cu with exceptionally high affinity (binding constant approximately 10 M, among the highest known for biological copper chelators), forming a square planar coordination complex where the copper ion is coordinated by the nitrogen atoms of the terminal amino group, the two peptide bonds, and the imidazole nitrogen of histidine

14 AST exists as two genetically and immunologically distinct isoenzymes, namely cytoplasmic AST and mitochondrial AST

The recommended frequency of use depends on the specific peptide and can range from daily use to several times a week

When outdoors, reapply every two hours