The dosage and frequency of B12 injections should be tailored to the individual patients needs, taking into account factors such as the severity of deficiency and ongoing absorption issues. Other things like age, health problems, and symptoms can also play a part
Journal of Endocrinology and Metabolism, 3(12), 715
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Middle-Age and Elderly Absorption of B12 can decrease with age as the ability of epithelial cells in the stomach to biosynthesise transport proteins reduces
[3] [8] Patients receiving B12 injections should inform their healthcare provider of all medications, as certain drugs (including metformin, proton pump inhibitors, and chloramphenicol) can affect B12 absorption or metabolism
Yang, L