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L-citrulline supplements (also commonly referred to as L-citrulline malate or free form L-citrulline) are becoming a popular choice among athletes, as this naturally occurring amino acid plays a key role in two very important body processes: the Krebs cycle and the Urea cycle of metabolism. In its dual roles, L-citrulline works to promote healthy energy production—like during physical activity—while also helping your body get rid of fatigue-causing toxins. It’s a non-essential amino acid, meaning your body can produce it on its own, but supplementing may be a good choice for added metabolic and energy support.