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The published research on oral B12 bioavailability consistently shows around 1% absorption meaning of a 1000mcg oral dose, only about 10mcg actually reaches your cells
At 2mL in a 10mg vial, a 2.5mg starting dose is exactly 50 units and a 5mg dose is exactly 100 units -- no awkward fractions
The best way for the body to retain B12 is through a B12 injection that goes right into the bloodstream
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B12 is also the second most essential nutrient for blood production
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