Are RXBARs kosher certified? All RXBARs are certified Kosher by the Orthodox Union when bearing the OU symbol. Buy kosher certified protein bars here Related articles Is RX Nut Butter Kosher certified? Are RX A.M. Oats kosher certified? Can you freeze RXBARs? Can I microwave RX A.M. Oats? Are RXBARs compliant with the Whole30® program rules?