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Sante Active Sedona Labs Similasan Sopharma Source Naturals Sports Performance StarChem Terra Ceutics Thermolife International Tribest Trimedica Twin Labs UltimateNutrition UltraLab Universal Nutrition VirtuVites Wakunaga/Kyolic Waterwise World Nutrition DEPARTMENTS Amino Acids Anti-Aging Allergy & Sinus Anti-Oxidants Aromatherapy Baby Health Bath & Body Bodybuilding & Sports Bone & Joint Books & Literature Brain & Memory Bulk Powders Clearance Cholesterol Circulation & Heart Cold & Flu Detoxification Digestive & Body Cleansing Enzymes Energy Eye Health Green Supplements Herbs Immune System Juicing Laxatives/Fiber Men's Health New Products Nutritional Oils Pet Nutrition Senior Health Sexual Health Skin Care Sleep & Relaxation Sprouting Stress & Mood Super Fruits Teen Health Vitamins & Minerals Weight Loss Water Purification Women's Health   Arginine L-Arginine is a conditionally essential basic amino acid involved primarily in urea metabolism and excretion as well as DNA synthesis. Arginine can serve as a source of energy, and is involved in various pathways throughout the body. Arginine supports the effect of exercise and is one of the most important amino acids involved in immune function. 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