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Patients on prolonged INH therapy often receive supplemental pyridoxine to prevent peripheral neuropathy, an adverse effect related to B deficiency

Common examples include fatigue or low energy with normal blood results, brain fog or reduced concentration without confirmed vitamin B12 deficiency, stress-related exhaustion or burnout, increased metabolic demand such as during illness recovery, high workload, or intense training, restrictive or inconsistent dietary intake, or suspected poor oral absorption despite normal serum levels

As far as I know treatment patterns for children are similar

If you have trouble with absorption, Vitamin B12 shots are more effective because they bypass the digestive system

*Product contains benzyl alcohol as an inactive ingredient Contraindications for Benzyl Alcohol This preparation is not advised in patients who are sensitive to cobalt and/or vitamin B12