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Sublingual tablets and nasal sprays bypass some of the digestive steps, which may be helpful if you have absorption challenges or prefer not to swallow pills. Vitamin B12 injections deliver the vitamin directly into your bloodstream, bypassing the digestive tract and providing faster, more reliable absorption

doi: 10.3389/fimmu.2023.1239142 104

Treatments are vehicle (V), CagriSema (CS, 2 + 2 nmol/kg), and calorie-restricted to match the weight of the CS rats (weight matched, WM)

That's why the Office of Dietary Supplements states that people over 50 should gain most of their B12 from dietary supplements or fortified foods