Tetragastrin (Cholecystokinin tetrapeptide; CCK-4) is the C-terminal tetrapeptide of gastrin. Tetragastrin can stimulate gastric secretion. Tetragastrin is a Cholecystokinin (CCK-4) receptor agonist. Gastric mucosal protection.

N-(3-Phenylpropionyl)glycine is an acyl glycine. Acyl glycines are normally minor metabolites of fatty acids. However the excretion of certain acyl glycines is increased in several inborn errors of metabolism.

Substance P 1-7 is the major bioactive metabolite formed after proteolytic degradation of the tachykinin substance P (SP)with anti-inflammatory anti-nociceptive and anti-hyperalgesic effects.