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Methylcobalamin is considered to be the most bioavailable form for methylation

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Individuals with conditions that affect their small intestine, such as Crohns disease and Celiac disease, may benefit from B12 supplementation, as well as those individuals who are on medications that affect B12 absorption, says Gans

Mechanism And Absorption Injections (IM or subcutaneous) Usually given as cyanocobalamin or hydroxocobalamin Absorbed directly from muscle or subcutaneous tissue into circulation Typically administered in a clinic, or self-injected after training B12 nasal spray Absorbed through the nasal mucosa directly into the bloodstream Avoids needles, first-pass metabolism, and GI issues Can be administered at home in seconds A quick side-by-side view can help: Clinical work with prescription cyanocobalamin nasal spray (e.g., Nascobal) shows that nasal B12 reaches effective blood levels and maintains them over time when used on a consistent schedule, with research from the Comparison of the Efficacy demonstrating superior absorption through nasal delivery compared to oral administration