Abundant research has shown that stress in a person’s life can deplete B vitamins in the human body. Physical stress such as overexertion, dieting, chronic illness, excessive consumption of alcohol and cigarette smoking increase the body’s requirement for essential nutrients. B vitamins are necessary for the formation of the central nervous system’s neurotransmitters, converting food into energy, forming healthy red blood cells, and maintaining healthy skin and hair. The B vitamins that form the B-Complex group , though separate chemicals, have functions that are interrelated.