Cholecystokinin Octapeptide (1-5) (desulfated) is a peptide hormone that belongs to the enkephalinase inhibitor family. It is a desulfated molecule with an amidated C-terminus and has been shown to inhibit the activity of aminopeptidases, which are enzymes that break down peptides. Cholecystokinin Octapeptide (1-5) (desulfated) is found in the brain where it acts as a neurotransmitter and has been shown to have anti-inflammatory effects. This molecule has also been found to be effective in the treatment of cerebral disorders such as Parkinson's disease, Alzheimer's disease, and Huntington's disease by inhibiting glutamate release from nerve cells.