A 2020 study found that those with vitamin B12 deficiency may present with cognitive disorder, though the deficiency was not shown to be a direct risk factor for cognitive decline ( However, results have been mixed and treatment with vitamin B12 wasnt effective at improving brain function in people with normal brain function ( Depression Its been suggested that there may be a link between low vitamin B12 levels and depression
Patients with Normal Intestinal Absorption Where the oral route is not deemed adequate, initial treatment similar to that for patients with pernicious anemia may be indicated depending on the severity of the deficiency
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Recommended treatment protocol: 1000-2000 mcg of B12 given through injections or under the skin, at first daily or weekly
Whether that combination makes sense for you is a clinical decision, not a one-size recommendation
