C22Galactosylceramide is a sphingolipid that has been found in the central nervous system.1,2C22Galactosylceramide levels are increased in the spinal cord, but not the brain or liver, of mice fed a methionine-restricted diet.1C22Galactosylceramide has been found in postmortem hippocampus from patients with Alzheimer's disease.2[Matreya, LLC.]