VIP (Vasoactive Intestinal Peptide): Research Guide to Mechanism, Findings & Regulatory Status
VIP — Vasoactive Intestinal Peptide — occupies an unusual position in the peptide research catalog: unlike most synthetic research peptides, it is a naturally occurring hormone that the human body already produces and uses continuously, in the gut, the brain, and the immune system. That “endogenous” status has generated a large, legitimate body of basic-science










