Studies were deemed ‘unclear’ if: (1) B12 status did not differ significantly between study groups, or (2) non-specific interventions were used that could obscure the potential effect of B12, or (3) >50% of statistical tests for oxidative stress did not reach significance, but showed an overall trend towards improvement, or (4) ≥50% of statistical tests for oxidative stress were significant, but at least one was significant against the oxidant properties of B12. 3.
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Vitamin B<sub>12</sub> in Relation to Oxidative Stress: A Systematic Review.
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