In the United States, food manufacturers are required to enrich breads and cereals from milled, refined grains with the following vitamin B: THIAMIN, RIBOFLAVIN AND NIACIN.
Bran, which is the outer layer of grain is rich in B vitamins and some other nutrients and minerals, but these usually get lost during refining process. Due to this, the government requires grain food manufacturers to add some B vitamins to their products during production. The B vitamins are very essential in man's nutrient because of their many benefits.
