The vitamin, choline, is still something of an enigma in the human system. It is one of the B-complex grouping of vitamins, but is unable to act on its own. Choline works well with Vitamin E, in the metabolism of fatty tissue and enzymatic activity. It also works to prevent liver and kidney disorders and is considered essential in the regeneration of tissue.
ref: Silent Healer (pg. 55) by Bill coats R.Ph., with Robert Ahola