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Short answer: If you can absorb B12, high-dose oral B12 (1,0002,000 mcg/day) is as effective as intramuscular injections for normalizing levels in most people (AAFP
Neuroprotective Effects Research indicates support for nerve regeneration and protection against neurological damage - documented in multiple animal studies
Systematic differential reporting patterns influenced by patient awareness, outcome severity, and regulatory activities create substantial ascertainment bias, and underreporting of mild events and chronic risks may persist 18
Clinical studies show very few side effects at normal dosages
Lancet 394 , 3950 (2019)
High-fat diet-fed C57BL/6J mice develop hyperglycaemia and impair glucose tolerance [1]
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