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22,23 In patients with a normal or low-normal serum vitamin B 12 level, complete blood count results demonstrating macrocytosis, or suspected clinical manifestations, a serum methylmalonic acid level is an appropriate next step 1,2,6,18 and is a more direct measure of vitamin B 12 's physiologic activity
However, it is unclear whether some facilities will continue to find ways to offer these alternative versions
However, more human studies are needed to confirm these findings (7)
B12 injections are elective wellness services
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