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? Are RXBAR products compliant with the Whole30® program rules? Can I eat RXBAR products past their best by date? What is the protein content in RXBAR products?