Vitamin B is essential for growth, development, and a variety of other bodily functions. They play a major role in the activities of enzymes, proteins that regulate chemical reactions in the body, which are important in turning food into energy and other needed substances. B vitamins can be found in liver, citrus fruits, mushrooms, nuts, peas, dried beans, wheat bread, potatoes, pork, seafood, liver, fish, chicken, lean red meat, nuts, whole grains, and dried beans.