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View compareBrain Support + features Cerenx® brand Citicoline (CDP 5'-phosphatidyl choline), a natural source of choline that promotes healthy brain structures and functions, including mood, mental energy, focus, attention, concentration, and mental acuity.* Now with the addition of MecobalActive® Methylcobalamin (vitamin B12). Methylcobalamin is the preferred high-absorption form of this essential brain nutrient.