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How B12 Injections Work Unlike oral supplements, intramuscular B12 injections deliver the nutrient directly into the bloodstream, bypassing digestive limitations
If you dont supplement, an elevated B12 can be a marker for underlying conditions including liver disease, kidney dysfunction, or certain blood disorders
Oral tablets, especially with absorption issues, offer much lower and more variable bioavailability, working more slowly
Summary: The recommended daily dose of vitamin B12 for UK adults aged 1964 years is 1.5 micrograms, whilst treatment doses for deficiency range from 50 g to 1,000 g daily or via intramuscular injection
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