[D-Arg2]Dermorphin-(1-4) amide is a N-terminal shorter peptide amide of [D-Arg2]dermorphin with the hypothermic effect.[D-Arg2]Dermorphin-(1-4) amide shows analgesic activity and degradation in soluble mouse liver and brain extracts.

Bentiromide is a peptide used in the bentiromide test to monitor the adequacy of supplemental pancreatic therapy and to screen exocrine pancreatic insufficiency.

4-Pyridoxic Acid, a catabolite of vitamin B6, is a water-soluble B-group vitamin that can be used as a urinary diagnostic biomarker for determining the nutritional status of these vitamins.