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Tissue-level deficiency of cobalamin is associated with an increase in the urinary and serum concentrations of an organic acid called methylmalonic acid, which is an alternative product of a cobalamin dependent pathway within the mitochondria
Babies who don't get any vitamin B12 can develop a deficiency and may sustain permanent neurological damage
Keep in mind that the best option depends on the underlying cause of the deficiency and your healthcare provider's recommendations
Side effects are generally mild
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