L-Norvaline is a non-proteinogenic amino acid, meaning it is not used in the synthesis of proteins, yet it holds significant importance in various physiological processes within the body. This compound is renowned for its ability to inhibit arginase, an enzyme responsible for the breakdown of arginine. By inhibiting arginase activity, L-Norvaline indirectly elevates arginine levels in the body. Arginine serves as a precursor to nitric oxide (NO), a potent vasodilator that relaxes blood vessels, enhances blood flow, and supports cardiovascular health. Consequently, increased nitric oxide production resulting from L-Norvaline supplementation can lead to improved blood circulation, which is beneficial for overall health and athletic performance. Moreover, enhanced blood flow to muscles during exercise may result in improved endurance, reduced fatigue, and increased nutrient delivery, thereby promoting better exercise capacity and recovery. Furthermore, L-Norvaline’s ability to modulate nitric oxide levels may also have implications for muscle growth and repair. By facilitating nutrient and oxygen delivery to muscle tissues, L-Norvaline could potentially support protein synthesis, muscle hypertrophy, and recovery processes, contributing to overall muscle health and performance. Despite its non-proteinogenic nature, L-Norvaline’s role as an arginase inhibitor underscores its importance in optimizing various physiological functions, making it a valuable supplement for individuals seeking to enhance cardiovascular health, exercise performance, and muscle growth.