Supports energy productionSuitable for everyday wellness seekersFree of gluten, dairy, soy, nuts, sugar, salt, preservatives, and artificial colors or flavors While 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. Frequently Asked Questions What is flushing?Flushing refers to temporary redness of the skin that may be accompanied by itching or burning. Unlike standard forms of niacin, The Vitamin Shoppe brand No-Flush Niacin capsules do not widen the blood vessels, which can cause skin irritation.