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For example, one study found that after taking 1,000 mcg of oral vitamin B12, only about 1.3% (13 mcg) is absorbed into the bloodstream

Benfotiamine B1 Not B12 but often combined to relieve nerve pain

But some studies have led to questions about high-level B12 doses in those not vitamin B12 deficient or at risk of a deficiency

Vegetarians and vegans are also at risk because B12 is mainly in animal products

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