DOUBLE STRENGTH 500 mg VEGGIE CAPSULES/FLUSH-FREE: Flush-free niacin contains inositol hexanicotinate, a form of niacin that consists of six molecules of niacin linked to a single inositol molecule NUTRITIONAL HEALTH: Niacin (vitamin B-3) is an essential B-Complex vitamin CERTIFICATIONS/CLASSIFICATIONS: Vegan/Vegetarian, Made without Gluten, Non-GMO GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation. Founded in 1968 by Elwood Richard, NOW is one of the largest independent, family- and employee-owned manufacturers of natural products