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Vitamin B12, also known as cobalamin, is an essential water-soluble vitamin that plays a vital role in many bodily functions including DNA, red blood cells, and nerve cell production

Side effects may include gastrointestinal upset, headache, or changes in appetite

Your nerves depend on B12 too it helps maintain the protective myelin sheath that insulates nerve fibers, similar to how rubber coating protects electrical wires

Safety & Considerations Active cancer or cancer history

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Research shows that around 50 percent to 60 percent of ingested vitamin B12 is usually absorbed when enough intrinsic factor is present in relation to B12, but absorption decreases drastically when this ratio changes