They don't : High levels of Vitamin B-12 reduce the absorption of certain antibiotics ... But there is little/no evidence that antibiotics decrease Vit-B absorption in any clinically meaningful way. For more information, I've attached an article from the NIH. Hope that helps! http://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/
Answered 2/28/2017
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