Why is my RXBAR lighter in color? Our bars appear lighter when they're freshest. RXBARs are made with real ingredients, so throughout the shelf life the color may change. See also: What is the shelf life of RXBARs? Related articles What is the shelf life of RXBARs? Are RXBAR products low FODMAP? Are RXBARs paleo-friendly? Can you freeze RXBARs? What is an RXBAR?