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This quick response occurs because the vitamin is rapidly absorbed into the bloodstream, offering fast relief from fatigue or brain fog, especially for those with deficiencies
1 2 J Neuropsychiatry Clin Neurosci
Jusko, William J
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Deficiencies can occur with medical conditions such as atrophic gastritis (which causes thinning of the stomach lining), pernicious anaemia, Crohns disease, celiac disease, lupus, or other immune system disorders and certain medications
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