Lecithin is an essential constituent of every cell in the human body. It is a phospholipid, consists primarily of the B vitamins choline and inositol and the essential fatty acid linoleic acid, and is important for the health and composition of the cellular membrane. Lecithin is required for fat breakdown in the digestive system, supporting fat metabolism and the maintenance of liver health. It also assists the normal triglycerides and cholesterol level in healthy individuals.