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Categorical variables were reported as percentages, and between-group comparisons were performed with the 2 test or Fishers exact test

If your symptoms fit a deficiency but the number looks normal, doctors can check active B12 (holotranscobalamin) or methylmalonic acid, which reveal whether your cells are actually short of usable B12

Side effects are rare but can include mild redness or soreness at the injection site

However, B-12 injections ensure you get the right levels of B-12 and that you receive it in the form that your body can most readily absorb and utilize by your body and which will not be broken down through digestion

Toxicity of mercury, copper, nickel, lead, and cobalt to embryos and larvae of zebrafish, Brachydanio rerio