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Potential Side Effects Though generally safe, B12 injections can have potential side effects
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Patients with Leber's hereditary optic neuropathy should avoid cyanocobalamin (hydroxocobalamin is preferred in the UK)
B12 injections are generally safe, but some people may experience mild side effects such as redness or soreness at the injection site, slight dizziness, nausea, or mild diarrhea
Among them are fatigue, dizziness, and muscle weakness
Areflexia can be permanent if neuronal death occurs in the posterior and lateral spinal cord tracts
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