Dietary supplement. Free form amino acid. TwinLab L-Cysteine capsules are easier to swallow and assimilate. Each capsule is oil free. Well tolerated by most highly allergic individuals. No tablet binders, coating or colorings. Free of most common allergens such as corn, soy, yeast, rice, barely, wheat, lactose (milk sugar) and all milk, citrus, fish and egg products. No added sugars, salt, artificial sweeteners, colorings, preservatives or salicylates. Packaged in a glass bottle for maximum stability, quality and freshness. This product is manufactured at our own state of the art facility.