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 does No B.S. stand for? What is the shelf life of RXBARs? What is the protein content in RXBARs? What are natural flavours in RXBARs? What is an RXBAR?