are there any side effects from having b12 injections Injection Safety, & Risks Vitamin B12 Injection Side Effects

The table below shows common IV B12 doses: Prescription Vitamin B12 Injection Protocols Prescription vitamin B12 injections are key for those with a deficiency

Possible adverse effects may include: Injection site reactions : Redness, swelling, irritation, or discomfort Gastrointestinal symptoms : Nausea, vomiting, stomach cramps, or diarrhea Headaches or dizziness Allergic reactions : Rash, itching, shortness of breath, or facial swelling (rare) Increased heart rate or anxiety (typically temporary from B-vitamins) Fatigue or weakness if used improperly Elevated liver enzymes when taken in excess particularly with methionine or choline Insomnia if taken late in the day due to increased energy levels Who should avoid or use caution

Usually, B12 is absorbed in the stomach with the help of an intrinsic factor protein

Ranke MB, Savage MO, Chatelain PG, Preece MA, Rosenfeld RG, Wilton P

Data were log 10 transformed if they were non-normally distributed and/or heteroscedastic

Some US packages can take longer