????? ????? ????? ????? ??????? B-complex ??? ???? ?????? ???????? ??? ???? ??? ???? ??????. ????? ??? ??????? ???????? ?????? ?? ??? ??? ??????? B12 , ?????? ????? ????? ??????. ????? ??????? ???? ??? ??????? ? ??????? ????? ??????? B ?????? ?? ??????????? ??????? ???? ???? ??????? ???????. ???????? ??? ??? ????? ??????? B ??? B12 ???? ???