Cellucor C4 Smart Energy, which comes in a can or a mixable powder form, is the perfect solution for moments of inspiration, motivation, creativity & focus. It contains natural caffeine, zero sugars, and mental focus ingredients including Brainberry & Nootropics. Take your mental focus to the next level with C4 Smart Energy Powder's nootropic blend. Contains Brainberry, L-tyrosine, Vitamin C, Zinc, and natural caffeine.