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While Vitamin B12 injections are generally safe for most people, there are potential side effects, especially if the injection is not administered properly or if the individual has an allergic reaction to the components of the injection

Such episodes were reported in 4.1%, 7.3%, and 5.7% in the placebo, 25 mg and 50 mg methylcobalamin groups, respectively

Digestive Discomfort and Nausea Cyanocobalamin can cause nausea, diarrhea, and stomach pain in some

And they had a paper where they could show a crushed nerve in the eye and mice could be completely regenerated

Then you may start again

Minimum recommended durations span 4 to 6 weeks for most gastrointestinal applications