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Some researchers wear nitrile gloves as an additional barrier

The distinction matters because treatment differs: intrinsic factor deficiency requires parenteral B12, whilst dietary deficiency often responds to oral supplementation or dietary modification

A peptide is a chain of amino acids held together by peptide bonds, and those bonds are precisely what digestive enzymes (pepsin, trypsin) are built to cut, with the acidic stomach environment finishing the job so an oral peptide is largely destroyed before it can be absorbed, which is why injection is the default

Arendt JF, Pedersen L, Nexo E, Srensen HT

A medial branch block works differently