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Testing serum levels of B12 can be done, but serum B12 levels tend to be highly inaccurate
The best sites for B12 injections
Whilst extremely rare, anaphylaxis to B12 preparations has been documented
Clinical Uses Vitamin B12 injections are used to treat or prevent B12 deficiency in various situations: Pernicious anemia: An autoimmune condition where gastric intrinsic factor is missing
Depending on the amount of vitamin B12 solution you inject, you may use a syringe that holds slightly more than you need
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