do vitamin b12 injections work immediately How Fast Does a Shot Work? Vitamin B12 Supplements and Injections

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Retrieved from Millennium Physicians

Summary: Vitamin B12 toxicity from supplementation is extremely rare, but persistently elevated serum levels may indicate underlying liver disease, kidney dysfunction, or haematological disorders requiring medical investigation

The duration that a B12 injection remains effective in your body depends primarily on which formulation you receive

[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