Citrulline is a non-essential amino acid naturally found in foods such as watermelon, squash, and cucumbers, and is also produced in the body. Once ingested, citrulline is converted by the kidneys into another amino acid, arginine, which plays a vital role in producing nitric oxide. Nitric oxide is essential for vasodilation, or the widening of blood vessels, which improves circulation and supports blood pressure regulation. By enhancing blood flow, citrulline is beneficial for maintaining cardiovascular health, improving muscle recovery, and boosting exercise performance. Additionally, citrulline helps reduce ammonia and lactic acid buildup, which can delay muscle fatigue and improve endurance during physical activity. Regular intake of citrulline-rich foods or supplements can promote vascular health, enhance physical performance, and support overall cardiovascular function.