As the However, while risks of severe toxicity are low, some side effects are still possible, such as: temporary symptoms, such as itching, swelling, or diarrhea allergic reaction damage from the injection hypokalemia, or low potassium levels infection negative interactions with certain medications, such as: metformin (Fortamet, Glucophage, Riomet) medications to reduce gastric acid, such as proton pump inhibitors or H2 receptor antagonists Always talk with a doctor before using vitamin B12 supplements
Reactions to the B12 itself could also occur, but they are extremely rare
Limited studies show no possible dose adjustments
Adding more diluent lowers the concentration, so you need to draw a larger volume for the same dose
There are different size needles for subcutaneous and intramuscular injections, so be sure to discuss your B12 injection site intentions with your doctor and follow his or her recommendation
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