We recommend that our products be used within two years from the date of manufacture to ensure the best-quality product. You can find the date of manufacture by looking at the lot code located on the back of the bottle or package. The first six characters indicate the date of manufacture; for example, “240326420055-10” means it was manufactured on March 26, 2024 (24=the year 2020, 03=the month of March and 26=the 26th day of the month). Many factors determine shelf life; over time, oxidation can cause a harmless color shift and ingredients can start to separate, which can decrease effectiveness. You can increase shelf life by storing the product in a cool, dry place away from sunlight.