how long b12 injection to work Injections: Who Should Get Them and Do They Last? how long for vitamin b12

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Metformin (for diabetes), proton pump inhibitors (such as omeprazole or esomeprazole), and H2 blockers (such as famotidine) can all reduce B12 absorption over time

If folate deficiency is suspected, it is reasonable to give oral folic acid (0.4 1 mg/day) without doing laboratory investigation for deficiency at least until the hemoglobin and mean corpuscular volume normalizes (or longer if the underlying cause cannot be eliminated)

Our course of action would typically involve modifying the formula to exclude potential additives and monitoring your subsequent treatments with heightened vigilance