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This is a commonly referenced study from 1963 claiming a half-life of 5-6 days: nature.com/articles/198200a0 Although I would not cite it as an authority, the six-day half-life has also made it onto the B12 page in Wikipedia, seemingly unchallenged
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High-dose B12 therapy can also boost nerve function and reduce pain
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Monitor for side effects like fatigue, headache and emotional changes
Scientists first isolated this protective compound while studying how the stomach lining repairs itself despite constant exposure to acid
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