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The study measured hair at 1, 3, and 6 months
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The synthetic origin is not a weakness
Intrinsic factor, a protein that shuttles B12 through the absorption process, becomes saturated after a meal containing an above-average amount of B12 and about 4 to 6 hours are required before it can efficiently absorb another dose (IOM, 1998)
High doses may increase bleeding risk, particularly with anticoagulants
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