Taurine is the most abundant amino acid in the brain, heart, and nervous systems. It plays a key role in your ability to manage anxiety and bounce back from stress. Taurine is necessary for cellular hydration, affecting sodium and potassium ions involved in muscle contraction. It has cardiometabolic effects, regulating insulin sensitivity, blood pressure, and heart function. Taurine is also a “performance” nutrient affecting brain and physical performance in sports and other high-stress situations such as when performing surgery in a state of fatigue.