here's one:
Stabilized CDP-Choline (cytidine 5'diphosphocholine) is a naturally occurring, water soluble biological compound that is an essential intermediate for the synthesis of phosphatidylcholine, a major constituent of the grey matter of brain tissue (30%). CDP choline is metabolized to yield the free nucleotide cytidine and choline. Scientific research demonstrates that CDP Choline consumption promotes brain metabolism by enhancing the synthesis of acetylcholine, restoring phospholipid content in the brain and regulation of neuronal membrane excitability and osmolarity (by its effect on the ATP-dependent sodium and potassium pumps).
http://www.raysahelian.com/cdp.html
paula