When you take B12 orally, it has to survive your digestive system, and only a fraction of it may actually reach your bloodstream
You've probably seen them advertised for energy and weight loss
[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
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Subcutaneous injection is not complicated
Never use a calculated BAC result to decide whether it is safe to drive