N-Acetylornithine is a minor component of deproteinized blood plasma of human blood. Human blood plasma contains a variable amount of acetylornithine averaging 1.1 +/- 0.4 μmol/L.

Humanin, an anti-apoptotic peptide of 24 amino acids, is a Bax inhibitor. Humanin prevents the translocation of Bax from cytosol to mitochondria, blocks Bax from the inactive to active conformation. Humanin is a mitochondria-associated peptide with a neuroprotective effect against AD-related neurotoxicity. Humanin also improves overall insulin sensitivity in animal. Humanin are related to aging. Humanin analogue, in which the serine at position 14 is replaced by glycine, names HNG.

[D-Pro2]-b-Casomorphin (1-5) ,bovine