In contrast, when bound to transcobalamin II, the half-life is significantly shorter, approximately 1.5 hours, although the final plasma curves for both forms yield similar half-life values of around 9.3 to 9.8 days due to the rapid reappearance of the radiocobalt label bound to transcobalamin I
If a mixed vial was left out overnight, the conservative research decision is to discard it because both stability and sterility history are compromised
Almost everything we know mechanistically comes from preclinical studies
Both errors lead to mis-dosing on every subsequent injection
Emergency physicians focus on ruling out life-threatening conditions, often missing chronic conditions like endometriosis that present acutely (Koninckx et al., 2021)
For those with normal absorption capacity, meaning being under age 50 with an intact gastrointestinal system and without diseases like pernicious anemia, we normally lose about one microgram of vitamin B12 a day
