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For people with a B12 deficiency, injections are often prescribed because they allow for better absorption than oral supplements

Nat Med 28(3):591598

Her research has been instrumental in establishing the clinical profile of next-generation metabolic therapies and advancing understanding of multi-receptor agonist approaches to obesity treatment

Possible Side Effects of Hydroxocobalamin Injection

Finally, any molecule absorbed through the gut wall must pass through the liver in what's called the 'first-pass effect,' where hepatic enzymes can further metabolize and deactivate it before it ever reaches the rest of the body