Vitamins and yoga lovers gracify.co.uk of group B are water-soluble active biological substances that provide most biochemical processes in the body. It should be noted that the complex effect of all vitamins of group B is more effective than the effect of each of the vitamins separately. Therefore, if there is a deficiency of these vitamins, drugs are prescribed that include the entire group. The body is not able to accumulate vitamins of group B, with the exception of B 12, so it needs to consume them daily.