Doctors Best Niacin Vitamin B3 Extended Release with Niaxtend 500 mg is an excellent dietary supplement in tablet form that provides niacin in a NiaXtend® extended release form. NiaXtend® Extended-Release Niacin delivers niacin in a form that helps minimize the frequency of unpleasant skin flushing commonly associated with its administration. Approximately 200 coenzymes consist of niacin and play a crucial role in metabolism and energy production in the body. NiaXtend® has been tested to encourage a favorable blood lipid profile. Research shows that niacin, in combination with a well-balanced diet, can help maintain healthy cholesterol levels already within normal limits. Helps support cardiovascular health. Encourages favorable blood lipid profiles. It helps produce energy in the body.