Gold Standard Bcaa Train + Sustain by Optimum Nutrition is a premium supplement formulated for use during workouts. It contains branched-chain amino acids (BCAA) in a 2:1:1 ratio, known for their ability to stimulate protein synthesis and reduce muscle catabolism, contributing to less fatigue and greater work capacity. It also includes essential electrolytes like magnesium and sodium, crucial for maintaining hydration balance and preventing cramps. The formula contains Rhodiola rosea extract to enhance physical stress resistance and Wellmune, a beta-glucan that strengthens the immune system. With a refreshing, light flavor, this product is perfect for high-intensity sessions, ensuring hydration and nutrition during workouts. It has been tested for banned substances, ensuring each serving is safe and effective. Recommended for endurance athletes, CrossFit practitioners, and bodybuilders.