Vitamin B-complex – is a food supplement of high-dose B vitamins. The vitamins contained in addition to the energy contribute to important physiological functions for good health. Protection of cellular structures from oxidative stress (vitamin B2) Normal function of the immune system (vitamin B12, folic acid) reduction of fatigue (niacin) normal nervous and psychological functioning (vitamin B6) Normal energy metabolism (vitamin B1) B vitamins play an important role in energy metabolism, converting the foot into energy and supporting heart and nervous system health.