Nature Made Flush Free Niacin 500 mg Inositol Hexanicotinate is a dietary supplement that has no side effects of flushing. Sourced from high-quality ingredients, this no flush Niacin supplement has no synthetic dyes, no artificial flavors, no preservatives, and is gluten free. Niacin, also known as Vitamin B3, is an essential nutrient that supports a healthy brain and nervous system. These 500 mg Niacin flush free softgels are a good choice for those who avoid good sources of Niacin such as meat, poultry, fortified cereal, legumes, and seeds in their diets. Adults, take one of these Nature Made Niacin 500 mg softgels daily with water and a meal. Nature Made supplements are quality you can trust. USP has tested and verified ingredients, potency and manufacturing process. USP sets official standards for dietary supplements. Visit the USP verified website for more information. *Based on a survey of pharmacists who recommend branded vitamins and supplements.