Why is my RXBAR lighter in color? Our bars appear lighter when they're freshest. Over time the color of RXBARs may change. See also: What is the shelf life of RXBARs? Related articles What is the shelf life of RXBAR Products? What does No B.S. stand for? What is the protein content in RXBAR products? Are RXBAR products compliant with the Whole30® program rules? Can I eat RXBAR products past their best by date?