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Description
Vitamin B12 given as hydroxocobalamin is usually intended for the muscle, and a needle that is too short can deposit it in the fat layer instead

Hydroxocobalamin and cyanocobalamin are commonly used forms for injections

This is the gold-standard way to answer does the oral form actually get in. What they found: ~38.4% oral bioavailability, with a half-life around 6.9 hours oral and 3.8 hours IV

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