how long does a b12 injection stay in your system Often Can I Take Injections? Vitamin B12: All You Need

Because B12 is water-soluble, the NIH Office of Dietary Supplements notes that no tolerable upper intake level has been established excess B12 is excreted by the body rather than accumulating to toxic levels

Other potential side effects include headaches and digestive discomfort

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Injections may be given daily for several days to a week, then weekly for several weeks

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