What is the sodium content in RXBAR Kids? Depending on the flavor, RXBAR Kids ranges from 65-80mg of sodium per bar. Find full nutrition and ingredient information on the bottom of this page. Shop RXBAR Kids here. Related articles What is the protein content in RXBAR Kids? What is the shelf life of RX Nut Butter? Is RXBAR Kids compliant with the Whole30® program rules? Does RXBAR use GMO ingredients? What does RX stand for?