High doses, often used to treat deficiencies, may lead to: Headaches, nausea, vomiting, and diarrhea Fatigue or muscle weakness Skin reactions such as rashes or itching Tingling or numbness in extremities Dizziness and, in severe cases, pulmonary edema and congestive heart failure Rare conditions like polycythemia vera, a slow-growing blood cancer In extremely rare cases, vitamin B12 can cause serious allergic reactions (anaphylaxis), characterized by facial swelling, difficulty breathing, and swallowing issues
The human body needs Vitamin B12 to function normally
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Anaemia from a B12 deficiency can also cause issues with your nerves
Alternative B12 Delivery Methods: Oral and Sublingual Dosing There are other ways to get vitamin B12, like oral and sublingual methods