Peptides are a class of molecules that include hormones like insulin and oxytocin.

“insulin which is involved in regulating our blood sugar or blood glucose levels is a peptide oxytocin which is sometimes called the love hormone although I wouldn't say that's the best description of what oxytocin is it's a neuropeptide hormone that is involved in everything from parir bonding to socialization but a bunch of other things as well those are just two examples of peptides that are familiar to most people at least by name and that exist within the tens of thousands if not hundreds of thousands of different peptides that EX exist within our brain and body”