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N-acetyl-cysteine (NAC) is an amino acid that is proven to be a glutathione precursor

[DOI] [PMC free article] [PubMed] [Google Scholar] 27.Gulcin

This discussion compares tripeptides, exemplified by the well-studied GHK, with larger peptides such as the cyclic heptapeptide CyRL-QN15, the human cathelicidin-derived antimicrobial peptide LL-37, and the peptide Andersonin W-1 (AW1), containing 7, 37, and 72 amino acids, respectively [25, 67, 68]

This system rated cartilage structural integrity from 0, defined as normal to 6, defined as complete disorganization, and assessed cellularity from 0, defined as normal, to 3, defined as hypocellularity, for a total possible score of 0 to 9