It is crucial to distinguish between medically indicated B12 replacement therapy and commercially marketed wellness injections, as they serve fundamentally different purposes and are subject to different regulatory oversight
Olivera PA, Lasa JS, Bonovas S, Danese S, Peyrin-Biroulet L
IM is traditional for rapid absorption
Reduced secretion of gastric acid and pepsin, from the use of H 2 blocker or proton-pump inhibitor (PPI) drugs, can reduce the absorption of protein-bound (dietary) vitamin B 12 , although not of supplemental vitamin B 12
It enters the interstitial fluid and is then absorbed into the bloodstream, achieving high bioavailability
They have no diagnosis, no recent bloods, and they want it today