Natural Factors' easy to swallow nonflushing niacin offers significant advantages over the regular types of vitamin B3 in the niacin or niacinimide forms. IHN non flushing niacin is much more active in a variety of clinical applications, including: high cholesterol, poor circulation, depression, and memory enhancement. This is why it is the most common form of vitamin B3 that is recommended by practitioners. Easy to swallow capsule form ensures optimum absorption.