Brain Function. Supports Brain Health, Performance, and Memory. Non-GMO. Gluten Free. Brain Health. Cognizin® Citicoline. Dietary Supplement. Citicoline (stabilized CDP Choline) is a naturally-occurring intermediate involved in the synthesis of phosphatidylcholine, a major constituent of the grey matter of brain tissue. Citicoline supplementation supports brain energy metabolism, and has been shown in clinical research to support attention performance in healthy adults and adolescents.