doctor endocrinologist doctor of medical sciences professor, head of the department, endocrinology and digital medicine of the national research institute of public healthello to us hello alexander vasilyevich please tell us how to determine that your body lacks vitamins of group b yes, and i want to say that you have typical complaints of a healthy person with vitamin deficiency. this is important, that is, if you have not found any illness in yourself and you still feel unwell, this is a typical manifestation of vitamin b12 deficiency - this is a very important vitamin, because in general, it affects the formation of red blood cells, if erythrocytes say it works poorly. this is called anemia, and hence everything else and maybe their bad skin dryness, because that if there is no oxygen to red blood cells, it just delivers oxygen, then all tissues suffer, and therefore in the first place, when everyone says, yes, check if you have vitamins vitamin b deficiency, because this is a tricky group. these are the so-called water- soluble vitamins. you took them, and they also wetted out. that is, it is his reserve can not. you must eat right all the time in o