Is RX Nut Butter Kosher certified? RX Nut Butter is not kosher certified at this time. Buy nut butters here See also: Are RXBARs kosher certified? Related articles Are RXBARs kosher certified? Are RXBAR Layers Kosher certified? Are RX A.M. Oats kosher certified? Is RX Nut Butter keto-friendly? Is RX Nut Butter vegan?