B group vitamins are very important for the organism because it directly involved in all metabolic processes, both in energy production and in the processes of degradation and synthesis of carbohydrates, proteins and fats. In addition, they are extremely important for the nervous system (thiamin, niacin, biotin), for the synthesis of some hormones, immune system maintenance and utilization of other vitamins and minerals, and are closely related to each other (folate, vitamins B6 and B12). The best dietary sources of vitamin B group include baker's yeast, liver, whole grains, rice, nuts, milk, eggs, meat (turkey), fish (tuna) and fruit (bananas). Lack of the vitamin B group had chronic consequences for the organism, preventing his growth and development, causes various skin diseases and fluctuations in hormonal balance. There may be damage to the nervous tissue and the impossibility of conducting a signal, leading to various physical and mental deformities and disorders that can be fatal. At the same time, long-time deficit in vitamins can cause death. Folate are in recent times most exploring vitamin this group, because of known effects on the etiology homocystanemia, which is recognized as a risk factor for vascular disease, cancer and birth defects. It is because of all the above functions that have these vitamins in the body, we decided to spell out their function, significance, that its lack of disturbances caused by the body and are important food sources.