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Common Side Effects While uncommon, some people may experience mild side effects after receiving a B12 injection, including[17]: Headache Nausea and vomiting Diarrhea Fatigue or weakness Tingling or numbness in the hands and feet These effects are typically short-lived and resolve on their own

Gkotzamanidou M, Terpou E, Kentepozidis N, Terpos E

or kidney disease (or if you are on dialysis)

Even acetaminophen (Tylenol), a commonly used over-the-counter pain reliever, can cause glutathione levels to plummet

Cytidine-5'-diphosphocholine (Citicoline): a pilot study in patients with non-arteritic ischaemic optic neuropathy