Choline is one of the essential amino acids involved in the synthesis of lecithin and phospholipids, and also plays a key role in the formation of neurotransmitters in the nervous system. Choline is often confused with inositol, which is similar in chemical structure (inositol is a B vitamin). Choline is present in food only as a derivative of the amino acid methionine.
Choline is found in almost all products of plant origin, but its accumulation in the human body is very insignificant. Therefore, the basic human need for choline is covered by the amount that enters the body from the outside. Most of the choline consumed is absorbed in the intestines, and a smaller part is digested. The optimal choline intake for humans is 600 mg per day.