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However, these are rare, and for the vast majority of the population, B12 injections can do nothing but good

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Parietal cells are in the lining of your stomach and have two important functions: Production of gastric acid Production of intrinsic factor - a protein needed to absorb vitamin B12 from food When your immune system attacks these cells (for example, in autoimmune gastritis), damage occurs to the stomach lining

What are the symptoms of low vitamin b12

The digestive process breaks down most nutrients before they ever reach your bloodstream