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Digestive disorders including Celiac disease, atrophic gastritis, and shortened small intestines can all increase the risk of vitamin B12 deficiency since nutrients arent as easily absorbed
Most of the data they did find came from studies in animals, including rats, and not humans
The choice usually depends on tolerance, convenience, regulatory access, and cost not a clear human-efficacy ranking
When liver cells are damaged or destroyed, they release stored cobalamin into the bloodstream
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