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Common side effects of vitamin B12 injections include mild diarrhea, itching, nausea and vomiting, dizziness, headaches, and hot flashes

Since B12 is water-soluble, excess amounts are excreted through urine rather than stored in the body, reducing the risk of toxicity

Medication Interactions: Certain medications, like proton pump inhibitors and metformin, may interfere with B12 absorption

For injectable products, extra attention to strength, route, storage, and supplies helps prevent avoidable order errors

Fewer than four stools per day (with or without blood) without other symptoms and normal inflammatory markers