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[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
Injections are very effective at raising blood levels of vitamin B12 and preventing or reversing a B12 deficiency
Energy, mood, and concentration levels often improve within 1 to 3 days after the injection
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This Vitamin B-12 shot can be used at home as an injection, under instruction of a doctor