H-Gly-Pro-Arg-Pro-NH2 is a peptide that mimics the N-terminal Gly-Pro-Arg region in the a chain of fibrin protein. H-Gly-Pro-Arg-Pro-NH2 prevents fibrin polymerization.

Kisspeptin 13 inhibits glucose-induced insulin secretion with an IC50 of 1.2 nM. Kisspeptin 13 activates the hypothalamic-pituitary-adrenal (HPA) axis, causes hyperthermia, motor behavior and anxiety in rats. Kisspeptin 13 interacts with α2-adrenergic and 5-HT2 serotonin receptors, exhibits antidepressant efficacy. Kisspeptin 13 is an activator for GPR54 and GnRH receptor, which enhances memory and can be used in Alzheimer's disease research.

6-Methylheptanoic acid (6-methyl-heptanoic acid) is orally toxic and is involved in the synthesis of polymyxin B and colistin hapten PMB-A.