Could some one please tell me does NDT work better than synthictic levothyroxine? I'm pemanantly tired I'm on 125 a day I'm 5ft and weight 15st........ I belive that I'm on to lower does for my size! As everybody's normal is different, I.e. if u have an 5ft 8st woman and me we wudnt have the same dose tablets b cos I'm bigger so i would need more meds.