Dietary Supplement. Crystalline pure. Yeast free. TwinLab Niacin (B-3) Caps are easier to swallow and assimilate. 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. Packaged in a glass bottle for maximum stability, quality and freshness. This product is manufactured at our own state of the art facility.