Below, we explore 16 common foods rich in niacin that you can incorporate into your daily meals. 1. What is Niacin (Vitamin B3)? Niacin, also known as vitamin B3, is a micronutrient vital for several bodily processes, including metabolism, nervous system function, and antioxidative defense. Learn about the benefits of niacin (vitamin B3) and discover 45 foods that are high in this essential nutrient. From peanuts and chicken to mushrooms and corn, find out how to include niacin in your diet. Here is a list of foods high in niacin (better known as vitamin B3), one of the best nutrients for raising good cholesterol. Explore the top vitamin B3 food sources to energize your diet, tackle niacin deficiency, and improve your overall health.