Solgar® No Flush Niacin 500 mg Vegetable Capsules contain the essential Vitamin B3, Niacin, which is one of the 8 B Vitamins and plays an important role in energy levels, assisting the metabolism and reducing tiredness and fatigue. Vitamin B3 is an essential water-soluble vitamin. This specific vitamin supports the body with several processes, ranging from managing energy levels, to skin health and a balanced mind. When eating foods rich in Niacin, the chances of side effect are very slim. However, they might arise when taking high dose supplements as the amount of the vitamin will be higher than when consumed through food. Regular high dose products containing Niacin often have the side effect of flushing. Solgar’s special complexed form of Niacin does not come with this side effect.