Vitamins belonging to the B complex group get converted into coenzymes. And these coenzymes are responsible for activation of enzymes that help in energy production. The point is that if the person is eating a balanced diet which is rich in most of the vitamins and other nutrients then there won’t be any need to take vitamin supplements like B vitamins for enhancement of energy. But if someone has a poor diet or is an alcoholic then in that case B vitamin supplements play a vital role in improving his/her health condition. Some people feel that they lack energy in their body even though they have a diet that is nutritious. Then in that case, it is vital to find out what causes this lack of energy. There might be various reasons that can make you feel exhausted in spite of a good diet and they are stress and lack of physical work outs or exercise. If that is the case then mind relaxation techniques, physical exercises and walking will give some help. It won’t be apt in such a case to take vitamin B supplements to stimulate the nervous system. This is because; such short term stimulation would be injurious and may cause health complications in future. However, those who have a poor diet must rely on vitamin B supplements for generation of energy.