Allocholic acid is a major component in bile from the river carpsucker, Carpiodes carpio.

Memantine, an amantadine derivative with some dopaminergic effects, has been proposed as an antiparkinson agent and has may be used to treat moderate to severe Alzheimer's disease. It acts on the glutamatergic system by blocking NMDA receptors.

DL-α-Hydroxyglutaric acid disodium salt is an α -hydroxyacid formed from the hydrolysis of (R) -5-oxy-2-tetrahydrofuran carboxylic acid, which is overproduced in human neurometabolic disease D-α -hydroxyglutaric uria. ?