Taurine is an amino acid found in meat, fish, and dairy. Unlike other amino acids, taurine does not work to build proteins and muscle, but it does play an important role in cell health, hydration, digestion, and more. Taurine is a natural antioxidant, working to reduce free-radical damage to the body and regulate the immune system. Taurine may also benefit heart health, boost energy, and improve your performance in the gym. Research suggests taurine supplementation has a beneficial effect on the heart as well. Scientists believe it helps maintain healthy blood pressure, cholesterol and blood sugar levels, and could reduce stress by calming the central nervous system.