For one, the FDA does not regulate supplements as strictly as other OTC medications, which means you cant be certain about what youre buying
After ingestion, stomach acid separates B12 from food proteins, and then intrinsic factor produced in the stomach lining binds to B12 so it can be absorbed in the ileum (the final section of the small intestine)
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levels below 200 pg/mL are generally considered deficient [*]