You may be having a reaction to the additives, fillers, sugars, artificial colouring, or flavourings. This may be a bit of trial and error to find one that suits you. I personally had allergic reactions with B12 injections - could barely breath for three days and a 4 month acne rash on my face, chest and belly. I now use sublingual (under the tongue) B12 spray from bioceuticals (Australian Brand) and i have used this product for 3 years with no problems.
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