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Starting with lower concentrations and gradually increasing helps identify your personal tolerance

Pernicious anemia , an autoimmune disease that destroys intrinsic factor production, prevents adequate B12 absorption regardless of dietary intake or oral supplementation attempts

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age 5 or above) and whether performed by the physician who is performing the primary procedure or by a different physician

Follow-up testing: Keep checking B12 levels and adjust treatment as needed, every 3-6 months