adverse effects b12 injections Common & Rare Side of Vitamin side effect from b12 injections
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This story originally appeared in British GQ.

Its an autoimmune disorder where your own immune system gets its wires crossed and starts attacking the cells in your stomach

Additionally, Clark points out that gastrointestinal conditions, such as celiac disease, Crohns disease and ulcerative colitis, can impair absorption in the small intestines, contributing to low B12 levels

Additionally, those with liver or kidney disorders might find the increased metabolic activity induced by these injections to be problematic, as these organs are crucial in processing the substances in the injections