?????? A ?-?????? ????? ??????? ????, ?? ?? combined ?????? ??? ?????? ????? ?????? ?????? ??????. ???? ????? ?-????? ?? ???????? ???, ????? ???????? ???? ???? ?? ??????? ??? ???. ?????? A ???? ??????? ??????, ???, ??????? ?????? (B3) ??? ???? ?????? ?? ??????, ?-????} ????? ?-????? ????. ?????? ?? ???????? A ?- niacin ?? ?????????? ???