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Description
Most people never check expiration dates on their peptide medications until something feels off

Vitamins B1, B6, and B12 are of special importance for the metabolism in the peripheral and central nervous system

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
