overdose of b12 injections Dose Awareness: Signs Symptoms Too Much B12 Symptoms: Overdose

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Summary: Excessive vitamin B12 intake rarely causes toxicity, but very high levels from supplements or injections may be associated with skin reactions such as acne-like eruptions, though serious adverse effects remain exceptionally uncommon

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Its used to treat B12 deficiency

While side effects are generally mild and temporary, they may include redness or soreness at the injection site, a temporary "flushed" feeling, or brief lightheadedness