Defeat Mental and Physical Exhaustion: Delay fatigue, reduce cell damage, and enhance your mental performance and mood A popular ingredient in most energy drinks and the 2nd most abundant amino acid in the body after glutamine, taurine is mostly found in the brain, heart and bloodstream where it functions as a powerful antioxidant and supports both mental and athletic performance. As a conditional amino acid, taurine can be produced in small amounts by the body, but is largely derived from food sources like meat, fish, and supplementation.