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Gastrointestinal disturbances such as constipation, gas, or diarrhea

doi:10.1111/j.1471-0528.1968.tb02022.x
You can combine your B12 shot with other injections and IV infusions offered at our clinic to provide additional nutritional support and hydration

So if there is an acute side effect, its likely to be minor

It is most useful when a conventional treatment path has been followed and has plateaued
