Nervonic acid (24:1n-9) is a very long chain fatty acid produced by elongation of oleic acid (18:1n-9) and derived from erucic acid (22:1n-9) . It is enriched in nervous tissue and is particularly abundant in sphingolipids, such as sphingomyelin in the myelin sheath of nerve fibers. Nervonic acid is poorly produced in demyelinating disorders, including multiple sclerosis and adrenoleukodystrophy, suggesting that dietary supplementation may be beneficial. Nervonic Acid methyl ester is an ester version of the free acid which may be more suitable for the formulation of fatty acid-containing diets and dietary supplements.