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It goes straight into your bloodstream, so your body can use it right away
This dose usually keeps B12 levels good for most patients
human bioavailability is unknown Subcutaneous injection Human subcutaneous bioavailability and pharmacokinetics are unknown Factor Convenience Oral capsules No mixing or syringe math Subcutaneous injection Requires reconstitution, sterile supplies, and injection-site planning Factor Evidence limits Oral capsules No controlled human dose, benefit, or safety trial Subcutaneous injection No controlled human dose, benefit, or safety trial Factor Can the amounts be treated as equal