Vitamin B or vitamin B complex supplements are very important since they possess the riboflavin, niacin, thiamine, pyridoxine, folic acid, pantothenic acid, cobalamin, biotin and vitamin B-12. B vitamins are essential in controlling enzymes that transform food to energy in the body. They also help with cell development and may aid cancer prevention. According to the American Cancer Society, a nutrition poor in folic acid may increase your risk of having particular types of cancer.