L-Citrulline 1500 Capsules 107g | 120 Capsules | 60 Servings Optimize your workout performance and enhance your cardiovascular health with Applied Nutrition’s premium L-Citrulline Capsules. L Citrulline is a naturally occurring amino acid that plays a vital role in nitric oxide production, which helps to improve blood flow, boost muscle endurance, and promote overall wellness.