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Lebers hereditary optic neuropathy: B12 supplementation can worsen the conditionconsult a specialist (MedlinePlus)

Neurological damage can occur without anaemia and may become irreversible if deficiency remains untreated for prolonged periods

In the nervous system, B12 deficiency causes symptoms affecting the nerves (numbness, tingling, tremors, balance problems) and the mind (depression, brain fog, mood swings, and, in rare cases, hallucinations and psychosis)

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Staying well-hydrated helps

In 2019, an internal medicine specialist could not find an objective cause for his B12 deficiency, and supplementation was stopped