B3 is also known as niacin and has two forms, niacin and nicotinamide or niacinomide. They are both found in food, but niacin is good for fat metabolism where as nicotinamide is good for anxiety and fatigue. Taking nicotinamide can cause flushing or red irritated skin.
Some functions of niacin are: breaks down amino acids, metabolizes of fats and carbohydrates, reduces cholesterol, helps nervous system and hormones.
Foods rich in niacin include: fish, meats, poultry, wheat germ, whole grains, prunes, dates, figs, and avocados.