Exposure of capsules to prolonged light or humidity may result in a harmless discoloration or darkening of the contents within the capsule. Store all products tightly sealed in a cool, dry place. Often times, the product is still completely safe to consume and this difference in appearance is purely cosmetic. If you have any other questions, please reach out to support@mindbodygreen.com with the order number, picture of the supplement+ in question, lot # and MFG date.