['Pyridoxine deficiency may be the cause of failure to respond appropriately to iron and erythropoietin (EPO) administration in hemodialysis patients.', 'We studied 36 patients on chronic hemodialysis amply supplemented with iron and EPO, who failed to raise hematocrit levels >33%. Patients were divided into three equal groups and evaluated for 6 months as follows: Group A -- no additional therapy; group B -- supplemented with oral pyridoxine 50 mg/day, and group C received 100 mg/day pyridoxine orally.', 'In all our patients, erythrocyte pyridoxine levels were initially within reference range for a healthy population and did not vary significantly during the study period. Likewise, ferritin levels and iron saturation values remained normal and constant. Hemoglobin and/or hematocrit levels remained practically unchanged in all three groups.'] Does vitamin B ( 6 ) therapy improve hematocrit in hemodialysis patients supplemented with iron and erythropoietin?