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