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While naturopathic doctors wouldnt prescribe B12 for most people without a lab-confirmed deficiency, studies show that B12 injections may improve endurance in athletes
If the primary benefit is energy improvement that could be achieved with $15/month oral B12 plus a multivitamin, the injection may not be cost-justified
doi:10.1177/15648265080292S118
Laboratory evidence: A serum B12 level confirming deficiency, or prior documentation of intrinsic factor antibodies for pernicious anemia
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