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There are no major side effects reported, though patients can experience diarrhea and swelling or redness at the injection site
Crohns disease, celiac disease, bacterial overgrowth, and other GI conditions that affect this area of the gut can impair B12 absorption
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This way, they hit your bloodstream almost immediately, preventing the most common vitamin absorption problems
This is an entirely separate regulatory path from drug approval and does not imply it is safe or effective as a therapeutic agent
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