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The main difference comes down to one critical factor: absorption
Key Takeaways Vitamin B12 is vital for energy and nerve health
Because B12 is water-soluble, the NIH Office of Dietary Supplements notes that no tolerable upper intake level has been established excess B12 is excreted by the body rather than accumulating to toxic levels
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Genera Fifty-nine bacterial genera were definitively identified in the cecal samples
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