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Vitamin B12 is absorbed in the stomach with the help of stomach acid and intrinsic factor, a protein produced by the stomach
[7] In addition, oral contraceptives have been noted to lower serum B levels, though this effect is usually clinically insignificant
You may also be given B12 injections if your body cannot absorb B12 from regular tablet supplements
Too much doesn't necessarily work better and increases side effect risk
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