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When you swallow a B12 pill, several steps have to work for it to be absorbed: stomach acid and the enzyme pepsin must release B12 from food or the supplement, the stomach must secrete a protein called intrinsic factor that binds to B12, and the B12-intrinsic factor complex must reach the ileum (the end of the small intestine) where it is finally absorbed
DailyMed OZEMPIC (semaglutide) injection, prescribing information, Section 12.3 Pharmacokinetics
It was proved that oral 1,000 mcg of B12 is only absorbed by 1.3% of the body, but the absorption rates of B12 shots are between 55% to 97%
For laboratories sourcing bacteriostatic water UK side, the specifications worth confirming are sterility, benzyl alcohol concentration and fill volume
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