Supports brain function. Cocnizin Citicoline. dietary supplement. Citicoline [stabilized CDP choline (cytidine 5'diphosphocholine)] is a natural intermediate involved in the synthesis of phosphatidylcholine, a major constituent of the gray matter of brain tissue (30%). The consumption of citicoline promotes brain metabolism by improving the synthesis of acetylcholine, restoring the content of phospholipids in the brain, which positively affects memory and other brain activities.