Lecithin is a fatty acid found naturally in the body. It works as an emulsifier, suspending fats such as cholesterol and other lipids in water and keeping them from mixing with other substances. The vital organs and arteries are thus protected from fatty build-up.
Lecithin is a type of lipid that is needed by every living cell in the human body. Cell membranes are largely composed of lecithin. The protective sheaths surrounding the brain are also composed of lecithin, as are muscles and nerve cells.