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Vitamin B6 supplementation increases immune responses in critically ill patients

Objective: To investigate whether vitamin B6 supplementation has a beneficial effect on immune responses in critically ill patients.
 
Design: A single-blind intervention study.
 
Setting: The study was performed at the Taichung Veterans General Hospital, the central part of Taiwan.
 
Subjects: Fifty-one subjects who stayed over 14 days in the intensive care unit completed the study. Subjects were not treated with any vitamin supplement before the intervention.
 
Interventions: Patients were randomly assigned to one of three groups, control (n=20), a daily injection of 50 mg vitamin B-6 (B6-50, n=15), or 100 mg vitamin B-6 (B6-100, n=16) for 14 days.
 
Main outcome measures: Plasma pyridoxal 5'-phosphate (PLP), pyridoxal (PL), 4-pyridoxic acid (4-PA), erythrocyte alanine (EALT-AC) and aspartate (EAST-AC) aminotransaminase activity coefficient, and urinary 4-PA were measured. The levels of serum albumin, hemoglobin, hematocrit, high-sensitivity C-reactive protein (hs-CRP) and immune responses (white blood cell, neutrophils, total lymphocytes count (TLC), T- (CD3) and B-(CD19) lymphocytes, T-helper (CD4) and suppressor (CD8) cells) were determined.
 
Results: Plasma PLP, PL, 4-PA and urinary 4-PA concentrations significantly increased in two treated groups. T-lymphocyte and T-helper cell numbers and the percentage of T-suppressor cell significantly increased on day 14 in the B6-50 group. Total lymphocyte count, T-helper and T-suppressor cell numbers, the percentage of T-lymphocyte cells and T-suppressors significantly increased in the B6-100 group at the 14th day. There were no significant changes with respect to immune responses in the control group over 14 days.
 
 
Published on 06-30-2008