Lecithin is a fatty substance found in various plants and animal tissues, primarily composed of phospholipids. It plays a crucial role in cell structure and function, helping to maintain the integrity of cell membranes. Common sources of lecithin include soybeans, sunflower seeds, and egg yolks. It is often used as an emulsifier in food products, allowing oil and water to mix smoothly. In addition to its culinary uses, lecithin is also available as a dietary supplement. It is believed to support brain health and improve cholesterol levels, although more research is needed to confirm these benefits. Lecithin is generally considered safe for most people when consumed in moderate amounts.