Optimum Nutrition Amino Energy RTD is a BCAA formulated ready-to-drink supplement that can be used for anytime energy and performance recovery. This version of amino energy is derived from the popular powder and chewable version of amino energy. This RTD version is convenient so you can grab one and go. This drink is designed to boost N.O. production, intensify energy, and increase your focus. Each one of these bottles is packed with 5 grams of micronized free form amino acids while providing 100 milligrams of caffeine (which is the same amount of caffeine you would receive from a strong cup of coffee).