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However, once a multi-dose pen is first used, the in-use period (discussed in the next section) takes precedence over the printed expiration date

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That said, there are several hypotheses to be aware of if you're concerned about the link between high vitamin B12 levels and cancer

Absorption is slower and more sustained, creating a prolonged release into the bloodstream

Here, we show how sub-physiological levels of B12 in the host antagonizes Mtb virulence, and describe a yet unknown mechanism of host-pathogen cross-talk with implications for B12 anemic populations