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To help bypass any barriers to absorption in the GI tract, many healthcare providers recommend B12 injections for deficiency, but research shows that very high doses of oral B12 (1,000 to 2,000 mcg once a day) can normalize serum B12 levels to a similar extent with minimal side effects
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7 You can obtain vitamin B12 from food sources such as shellfish, meat, eggs, dairy products, or other vitamin B12-fortified foods
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