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Not only is this a waste of time, but it also makes us look like we are on a witch hunt

Like hydroxocobalamin, it can be used to treat nutrient deficiencies in people who have difficulty getting enough vitamin B12 in their regular diets

Drug Metab Disposition 34: 1600-1605

[1] Because intrinsic-factor-dependent uptake in the distal ileum can be absent in conditions such as autoimmune gastritis, pancreatic insufficiency, or bariatric surgery, the intramuscular or subcutaneous route bypasses gastrointestinal barriers and reliably restores serum concentrations

And what are the real risks of using them

It happens when red blood cells are too big