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Injections are often recommended for those with absorption challenges or severe deficiencies, ensuring a more reliable and direct delivery of B12 for improved energy, mood, and overall health

[153] There is evidence that for elderly people, physicians often repeatedly prescribe and administer cyanocobalamin injections inappropriately, evidenced by the majority of subjects in one large study either having had normal serum concentrations or having not been tested before the injections

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There is no consensus on the tolerable upper intake level of vitamin B12 or if too much is toxic