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Reports of stability in gastric juice are not the same as systemic bioavailability, and routes of administration in published rodent work include intraperitoneal, oral (drinking water), and topical comparisons across routes are not always controlled in primary studies (Cerovecki et al., 2010)
doi: 10.1186/s12953-018-0131-y 42
However, research is still ongoing, and more large-scale clinical studies are needed to fully confirm these effects
The Pernicious Anaemia Society is getting frequent worried phone calls from members desperate that their B12 injections have been postponed due to the coronavirus crisis