3rd Party Lab Tested for Purity & Quality. 500 mg of Niacinamide per Tablet - 240 Tablets per Bottle. Non-GMO & Gluten-Free. Proudly Made in USA, GMP Compliant, FDA Registered Facility. No Artificial Color, Flavor, or Sweetener, No Preservatives, No Sugar, No Milk, No Corn, No Soy, No Egg, No Lactose, No Gluten, No Wheat, No Yeast, No Fish. Sodium Free.