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Neurologic manifestations will not be prevented with folic acid, and if not treated with vitamin B12, irreversible damage will result
Headaches: Headaches can occur as a side effect, though they are generally mild and short-lived
Further studies are needed to determine whether other factors may also be involved
For individuals managing a straightforward B12 deficiency without broader nutrient needs, shots remain one of the most practical and cost-effective treatment options
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