Optimum Nutrition Essential Amino Energy Watermelon 30 Servings is an excellent source of essential amino acids. Nitric oxide is a source of antioxidants. Amino Energy accelerates muscle repair and recovery, also improves and build tissues. Amino Energy helps replenish natural energy and includes BCAAs and arginine to increase blood vessel pumping with natural energy supplements to help get good results from exercise and build strong muscle and tissue that are hard to destroy.