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Prolonged deficiency allows more extensive damage to accumulate, particularly to the nervous system, which requires longer to repair
Here's what often kicks in first: Within 1-3 days: Energy and alertness
Side effects are rare and usually mild (slight injection-site soreness)
J., Fine, A., et al
Nevertheless, his case is sometimes cited as an example of vitamin B12 deficiency and how severe it can get with time, if left untreated, it can lead to serious health issues, including neurological symptoms like dementia
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