Supports Exercise Recovery Energy and Detoxification. Suitable for Vegetarians. L-Citrulline is a natural amino acid that supports sports performance and good health while at the same time helping the liver detoxify. L-Citruline helps the body rid itself of ammonia a by-product of intense exercise. This clearing enables the body to recover after a workout and it frees ATP energy for enhanced uses such as respiration and signal transduction.