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Key Takeaways Vitamin B12 injections are key for treating deficiency
This autoimmune condition attacks the intrinsic factor, a protein your stomach makes that's required for B12 absorption
The outer thigh, midway between the hip and the knee, is a reliable subcutaneous injection site and is the preferred alternative when the abdomen is uncomfortable or if site rotation requires a break from abdominal injections
This is not a supplement filling a theoretical gap
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