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can b12 injections affect kidneys Vitamin B12: Overdose and Side Effects ⚠️ Vitamin B12 Injection: The
Description
And for a lot of people, the issue is with their ability to absorb Vitamin B12 in the gastrointestinal tract - a problem that is also often accompanied by IBS-type symptoms
Studies that used 1 mg/day in oral and intravenous trials did not show meaningfully better outcomes than lower doses, and higher doses were associated with more reports of headache, diarrhea, and gastrointestinal effects

doi:10.1007/BF02837864

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