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Factors That Affect How Long B12 Injections Last Several factors may influence how long the effects of a B12 injection last in your system, potentially explaining why some patients require more frequent injections than others, even with the same underlying condition

It's typically diagnosed through a complete blood count (CBC) and peripheral blood smear, which reveals the enlarged red blood cells

Change in the vitamin B 12 level in the blood in certain stomach diseases

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Consume B12-rich foods like meat, fish, eggs, or supplements to prevent deficiency-related complications, especially for vegans or those with absorption issues

Drug/Laboratory Test Interactions