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Low B12 levels are associated with symptoms like: Fatigue or low energy Difficulty concentrating Numbness or tingling in hands and feet Swollen, inflamed tongue Dizziness or unsteadiness Muscle weakness Vision problems like blurriness or double vision What are the possible B12 injection side effects
[11] In practice, the benefit of treating a true B deficiency in pregnancy, preventing anemia and neurological injury, is considered to far outweigh any theoretical risks, under the guidance of a healthcare professional
However, if your B12 levels are already within a healthy range, you may not experience a dramatic or long-lasting energy boost
American Journal of Clinical Nutrition, 115(4), 787-789
EBM Consult
In addition, hydroxocobalamin may be used as part of the treatment for cyanide poisoning (as an antidote), although in such emergency cases very high doses are administered under hospital care
