Thiamine, Folate, and Niacin are all one of the B vitamins. THIAMINE is an essential nutrient that helps the body convert carbohydrates into energy. Folate is a water-soluble vitamin that helps the body form red blood cells and metabolize proteins. Niacin is a water-soluble vitamin that helps the body break down fats and proteins. All three of these B vitamins are important for maintaining good health.