NOW Supplements, Niacin (Vitamin B-3) 500 mg, Sustained Release, Nutritional Health, 250 Tablets – NIACIN 500 mg TABLETS/VITAMIN B-3: Niacin (Vitamin B-3) is an essential B-group vitamin necessary for good health. – Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery – SUSTAINED RELEASE TO MINIMIZE FLUSHING: Niacin supplements may sometimes temporarily cause flushing and/or itching, but this sustained release tablet should minimize those symptoms. To further limit these uncomfortable but not dangerous symptoms, take daily and avoid missing doses. – CERTIFICATIONS/CLASSIFICATIONS: Soy Free, Made without Gluten, Dairy Free, Egg Free, Nut Free, Kosher, Vegan/Vegetarian – GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation). – Packaged in the USA by a family owned and operated company since 1968 – During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers recommendations, when provided.