XTEN is infused with essential amino acid (EAA) to address the intra-workout period when critical nutrients are needed to fuel performance, blunt fatigue and accelerate recovery. The unprecedented XTEN is created from the collaboration with König Nutrient which produces the finest vitamins and minerals.

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XTEN delivers over 11,000 mg of all 9 essential amino acids, including BCAAs, which is clinically dosed to work synergistically in order to stimulate muscle protein synthesis, promote muscle growth, enhance recovery and decrease muscle soreness from the most intense training sessions.

Muscle Kingdom® took XTEN's formula one step further by adding other ingredients such as glutamine and taurine, that has been proven to accelerate recovery, replenish energy stores, improve strength and keep you hydrated during workouts.