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B12 has become something of an it supplement lately, with celebrities getting B12 shots after pulling all-nighters and athletes using them to enhance recovery
Instead, try taking the supplement with meals, switching formulations, or discussing alternative routes such as intramuscular injections with your healthcare provider
Retrieved 20 February 2020
Where serum B12 results are borderline or do not fit the clinical picture, further tests such as active B12 (holotranscobalamin), methylmalonic acid, or homocysteine may be helpful
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