But after years of brain longevity research, Nakazaki believes there’s one ingredient that stands above the rest. Enter: Citicoline. “This nootropic has impressive efficacy to nourish and promote our brain and executive function. It supports the structure and function of our neurons, neurotransmitter levels, and diverse cognitive metrics spanning brain energy, attention, memory, and cognitive performance,”* Nakazaki explains. Here are just a few of citicoline’s benefits, as demonstrated by clinical studies:* Taking a clinically researched, full-potency dose of citicoline (i.e., 500 milligrams) daily can help support memory, promote mental clarity, and even improve cognitive performance.* (Hint: You’ll find that exact dose in brain guard+, plus impressive nootropic ingredients kanna and resveratrol.)