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It is also used to manage adult patients with vitamin B12 deficiency that occurs due to dietary, drug-induced, and/or malabsorption factors

Dose-Dependent Effects of Recombinant Human Insulin-like Growth Factor (IGF)-I/IGF Binding Protein-3 Complex on Overnight Growth Hormone Secretion and Insulin Sensitivity in Type 1 Diabetes

doi:10.1176/appi.neuropsych.11020052

In fact its thought that up to 90% of people following these diets have a deficiency due to b12 being present naturally, only in animal foods

Something else to consider is that some people might have trouble with the digestion and absorption of the nutrients from vitamin B12 tablets