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If the patient has an autoimmune disease or another condition that prevents the stomach from making intrinsic factor, then Vitamin B12 injections may be a better option
This is why all B12 treatments experts advise not to retest B12 levels after treatment has begun as they are not a reliable guide to whether treatment is being effective
[114] This functionality is lost in vitamin B 12 deficiency, and can be measured clinically as an increased serum methylmalonic acid (MMA) concentration
Always double-check calculations before injecting
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