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Severe side effects are rare but include anaphylaxis (especially in those allergic to cobalt or B)
turn the solution container upside down and slowly pull on the plunger to withdraw the desired dosage of vitamin B12 into the syringe
These include serious infection, uremia or renal failure, drugs with bone marrow suppression properties (e.g., chloramphenicol), or concurrent undiagnosed folic acid or iron deficiency anemia
Many of our readers find it very difficult to source B12 shots
an unusual or allergic reaction to cyanocobalamin, cobalt, other medicines, foods, dyes, or preservatives
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