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These may not be dangerous, but they matter

You might see side effects including nausea, constipation, or reflux symptoms

Healthy intestinal mucosa is important for the absorption of di-/tripeptides

Administering at the same times each day under similar conditions (e.g., before a meal) helps minimize variables

Behera MM, Purkait S, Ghosh A, Sable MN, Sahu RN, Chhabra G

becomes particularly relevant, and the answer truly varies depending on a few key factors: The Underlying Cause of Deficiency: The Underlying Cause of Deficiency: Pernicious Anaemia/Malabsorption: For those with an inability to absorb B12 orally (like in pernicious anaemia), injections are typically a lifelong treatment