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Prolonged deficiency allows more extensive damage to accumulate, particularly to the nervous system, which requires longer to repair
Historically, it was assumed that vitamin B12 toxicity is virtually impossible
The panel agreed that initial treatment should be parenteral for severe cases, while high-dose oral B12 can be considered for maintenance
Careful not to go too low (seek instruction)
The doctors then give one dose every month until the deficiency is reversed fully
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