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29 (2 Suppl): S74S85
In-vitro assays show the molecule is membrane-permeable, which supports the possibility of oral absorption, but the animal efficacy studies used injection, and no study has directly compared oral versus subcutaneous bioavailability
Underlying conditions: digestive disorders like Crohn's or celiac disease, or autoimmune conditions, can cause you to use up B12 faster and may call for more frequent injections
This product is available in both preservative-free and preserved formulations, each supplied in a 30 mL vial at a concentration of 500 mg/mL
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