Dietary supplement. Free form amino acid. TwinLab L-Arginine capsules are easier to swallow and assimilate. L-Arginine is an amino acid. Well tolerated by the most highly allergic individuals. No tablet binders, coatings or colorings. Free of the most common allergens such as corn, soy, yeast, rice, barley, wheat, lactose (milk sugar) and all milk, citrus, fish, and egg products. No added flavorings, sugars, salt, artificial sweeteners, colorings, preservatives or salicylates. This product is manufactured at our own state of the art facility.