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They're not harmful for most people, but they're also not magic
Individuals with certain health conditions, such as Lebers disease (a hereditary eye disease), should avoid B12 injections, as they can exacerbate symptoms
If low levels of B 12 remain for a long time, the condition also can lead to irreversible damage to nerve cells, which can cause the following symptoms: numbness and tingling in the hands and feet difficulty walking muscle weakness irritability memory loss dementia depression psychosis
Factors like starting weight, diet, and activity all play a role
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