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
Dr who attended me was very thorough in his examination and explained in detail the root cause of my symptoms
Schmidt RE, et al
Contraindications include known hypersensitivity to any component of the injection (including cobalt hypersensitivity), a history of severe reactions to thiamine/pyridoxine/cobalamin injections, and Lebers hereditary optic neuropathy (for B12-containing products)
Explore Related Research Customer Reviews 3 reviews Marco D.Verified PurchaseMay 28, 2026 Reconstituted perfectly clear, no cloudiness or particles
[5] By simultaneously providing all these B vitamins, the injection ensures that the body has all necessary co-factors in adequate supply
