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is taking vitamin b12 nasally and by injection dangerous Side Effects: How Much Too Much? Vitamin B12: Overdose and Side
Description
Because injections do not rely on stomach acid or intrinsic factor, a much larger and more reliable share of the dose reaches your bloodstream, even when gut absorption is poor

You must not be given Cobal-B12 injection if you have had an allergy to: Symptoms of an allergic reaction may include shortness of breath, wheezing or difficulty breathing

Vitamin B2, like vitamin B1, can lead to anaphylactic sensitivity

Neuroprotection for traumatic brain injury: translational challenges and emerging therapeutic strategies
