Lecithin is a concentrated source of phspholipids (phosphorus containing fats). Phospholipids are primary sturctural components of every cell membrane, which are composed a bi layer of phospholipids with protein islands and other essentila strucures afloat in htem. Lecithin also provides precursors (e.g. phospatidyl choline) to essential brain neurotransmitters. As little as 35 mg a day of phosphatidyl choline was shown by brain researcher Dr. Richard Wurtman to enhance mental acuity, for example. Lecithin from soy oil, the major commercial source, is customarily more than 23% phosphatidylcholine, 20% phosphatidylethanolamine, and 1 4% phosphatidylinositol. Lecithin is also renowned as a nutrient to lower blood fats and serum cholesterol, while supporting the integrity of the myelin sheath that insulates nerve fibers.