Vitamins that belong to this group are actually a complex of several water-soluble substances, having a number of important functions in your bodies. A common feature of all of the B vitamins is their involvement in the metabolism, controlling and supporting the transformation of proteins, carbohydrates and fats. In addition, vitamin B2 regulates cellular processes, B3 is a precursor of steroid hormones, B5 is essential for the synthesis of coenzyme Q10, B6 reduces the level of harmful homocysteine and initiates the production of adrenaline and serotonin. B12, in turn, lowers cholesterol and supports the production of red blood cells. Vitamin B complex is also very important for the proper operation of the nervous and muscles system, and also gastrointestinal tract.