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This brings us back to the title of this essay

Research and Science

GHK-Cu is a naturally occurring copper-binding peptide found in human plasma, saliva, and urine

J Pract Tradit Chin Int Med

[DOI] [PMC free article] [PubMed] [Google Scholar] 204.Chen H., Song Y.S., Chan P.H

There are a wide variety of active peptides that include antioxidant peptides and opioid peptides that have important neuroprotective effects
