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People with Lebers hereditary optic neuropathy, a rare inherited optic nerve disorder, may be at risk of severe optic nerve damage with cyanocobalamin

When you run low, the result is often a stubborn, draining sort of tiredness that no amount of coffee seems to fix

According to WebMD, The more common B12 injection side effects are: Swelling at the injection site Mild dirhhea Itching Swelling in the body Low potassium (weakness, irregular heartbeat) There is a case report of an anaphylactic reaction to a B12 injection in a 55 year old women receiving cyanocobalamin, but these reactions are thought to be rare

Still hasnt been reported