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