Dietary Supplement. Crystalline Vitamin C. TwinLab C-1000 Caps are easier to swallow and assimilate. Well tolerated by most highly allergic individuals. No tablet binders, coatings or colorings. Free of the most common allergens such as yeast, 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 in our own state of the art facility. Packaged in a glass bottle for maximum stability, quality and freshness. One hard gelatin capsule contains 1000 mg of Pure Crystalline Vitamin C.