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Anaphylactic shock and death have been reported

In vitamin B 12 deficiency, red blood cells are unusually large and appear abnormal

While individual patterns vary based on personal fat distribution and receptor density, users commonly report improvements in areas that had not responded adequately to diet and exercise alone

[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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