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doi: 10.1016/j.biomaterials.2007.05.040

Bariatric Surgery and Vitamin B12: Why is Vitamin B12 prescribed to Bariatric Patients That Underwent Gastric Bypass Surgery

American Pharmacists Association

Oral administration is typically preferred for gut-specific goals, though injectable can address both gut and systemic inflammation simultaneously

Not all medications and nutrients are small enough to get absorbed or need breakdown via gastric enzymes for activation for the sublingual route, but whenever possible there is a benefit to using this route as it bypasses potential damage/absorption issues in the GI tract
The problem is, (at least in these older editions), the RDA is described as being tiny (2.4mcg), which is true, but how the absorption mechanisms affect dosage quantity and frequency are not discussed
