@skinecologic: As cosmetic formulators, we think about the formula and its packaging together at every step of product development. Some ingredients are naturally very stable. Others are sensitive to oxygen, light or heat. Take a serum with a beautiful colour we want you to see. An opaque bottle can protect it from light, but clear glass lets you enjoy the colour. If the colour fades under UV light, we can include a UV absorber in the formula to help it stay true for longer. For ingredients prone to oxidation, we can use antioxidants to help slow that process. Even a well-formulated serum changes over time. So go easy on those bubbles 🫧, close the bottle after use and keep it somewhere cool and dry, away from direct sunlight and big swings in temperature or humidity. You paid good money for these products, and I want you to get the best out of every drop. 💙