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In addition to limited absorption via the IF, the intake of high-dose supplements leads to passive diffusion, i.e., the vitamin can freely enter the bloodstream without IF binding and receptor uptake
Before-and-after claims : diet, training, other compounds, lighting, and selection bias can all change the picture
Drug/Laboratory Test Interactions Persons taking most antibiotics, methotrexate, and pyrimethamine invalidate folic acid and vitamin B 12 diagnostic blood assays
Recommended Frequency: Weekly
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