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When you take vitamins orally, your digestive system has to break them down, and only a fraction actually makes it into your bloodstream
B12 is important because it keeps your nerve and blood cells healthy
Various problems with the stomach and small intestine can therefore contribute to the gradual depletion of B12 levels in the body
Oral B12 has only about 1 to 2 percent absorption, while injections are absorbed at 55 to 97 percent
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