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Neurosurgery with deep brain stimulation is an option for unmanageable dystonia or tremor [230, 231], rhizotomy for severe spasticity with associated deformities [232], and percutaneous gastrostomy to ensure adequate nutrition when dysphagia is severe [233]

No, your body will only store what it needs and the excess is be excreted out of the body naturally

Administration Route: Subcutaneous injection using the prefilled pen

Of course, this depends upon the cause of your deficiency such as malabsorption, pernicious anemia and other conditions that create vitamin B12 deficiencies and if the cause has been effectively treated