The C15 Super Booster can range from a clear to pale peach and even amber tone. This variation is normal and doesn't affect its effectiveness. Vitamin C products like the C15 Super Booster tend to darken over time after opening due to exposure to air and light. This darkening doesn't mean it's spoiled, but it does indicate a decrease in potency. We recommend using your unopened C15 Super Booster within 18 months (shelf life) of purchase. Once opened, use it within three months (PAO) for optimal effectiveness. If your C15 Super Booster turns dark orange or brown along with a noticeable texture change, it's a sign that the vitamin C has degraded significantly and it's time to replace it for full benefits. Tip: use a Sharpie-type marker to write the date of opening on the bottom of the bottle. To learn more about the C15 Super Booster color changes, visit our Help Center article.