Opiorphin is a 5-amino acid peptide found in human saliva that inhibits enzymes responsible for degrading natural enkephalins. Researchers study its role in modulating pain and mood.
In the literature, Opiorphin appears most often in work focused on pain research, mood and nerve pain. Studies in this area tend to look at mechanisms and observed effects in laboratory and preclinical settings rather than outcomes in people, so the picture is best read as a map of where researchers have been curious — not as evidence of any benefit.
Opiorphin is catalogued here under powder peptides. Coverage of this compound varies in quality and depth, and much of it remains early-stage. Reading the underlying research directly is the only way to judge how strong any particular finding is.