NOW L-Arginine 500 mg is a dietary supplement that provides a conditionally essential amino acid involved in urea metabolism, excretion, and DNA synthesis. Each capsule contains 500 mg of L-Arginine, a nitric oxide precursor that supports muscle growth and overall cardiovascular health. The product is pharmaceutical grade and suitable for vegetarians and vegans. It is free from sugar, salt, starch, yeast, wheat, gluten, corn, soy, milk, egg, shellfish, and preservatives.