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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

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They occur due to megaloblastic anemia resulting from impaired red blood cell formation

Description A single-component research material supplied for controlled research environments

Reported / Possible Side Effects Mild, anecdotal: Occasional reports of mild headache, transient jitteriness, or injection-site reactions