L-citrulline is an amino acid that is part of the urea cycle along with arginine and ornithine. This is important in sports due to the body's ability to eliminate toxins such as ammonia that reduce our ability to resist fatigue. Citrulline malate is a powerful ally for athletes, known for its ability to improve performance and recovery. By promoting the production of nitric oxide, it helps improve blood flow, delivering more oxygen and nutrients to working muscles.