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Energy ProductionVitaminDietary SupplementQuality Promise Tested & TrustedGluten FreeDairy FreeSoy Free Nut FreeWhile standard forms of niacin have a blood vessel-widening effect-which can lead to flushing-The Vitamin Shoppe® brand No-Flush Niacin 500 MG won't irritate your skin.This once-daily essential B vitamin helps your body metabolize carbohydrates fats and proteins so you can have more energy to do what you love and strive for lifelong wellness.