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That gap is worth planning around: the beyond-use window of a reconstituted solution (covered in the storage section) can be shorter than the drug supply lasts, especially for the 10 mg vial, so re-order and reconstitution-volume decisions should be made against the shorter of the two limits the stability window or the drug supply not just the drug supply alone
Think of this as the express lane for absorption
B12 injections generally work faster and suit people with absorption problems or severe deficiency, while supplements are a suitable, lower-cost option for mild, diet-related shortfalls
Individuals following strict vegan or vegetarian diet are also at a higher risk of B12 deficiency because plant-based diets typically lack sufficient B12
H2 receptor antagonists also affect B12 absorption, but less than PPIs
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