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GHK-Cu, or glycyl-L-histidyl-L-lysine-copper, is a naturally occurring copper peptide complex found in human plasma, saliva, and urine

This places it in the same category as many research peptides, available through certain channels but without official sanction for human use

Sequence:H-Aib-His-D-2Nal-D-Phe-Lys-NH2

The medication is not recommended during pregnancy, in patients with severe gastrointestinal disease including severe gastroparesis, or in those with a history of pancreatitis

That means the practical answer to how long is bac water good for after opening is usually up to 28 days, provided the original expiration date has not arrived earlier and the vial still meets visual and handling checks