The digestive system reduces Lecithin from food sources to produce Choline. The major sites of Choline's biological action are the nervous and cardiovascular systems, and the mechanisms which store and transport fats and cholesterol. The important functions of Choline in the body are i) as a precursor of Phosphatidyl Choline, an essential compound of all body cell membranes, and ii) as a precursor of Acetylcholin, an important neurotransmitter.