Antioxidants are powerful skin protectors. If they are not stored properly they can become inactive.
If your product is in a jar or bottle that needs to be opened then it is exposed to air every time you open it. Using opaque glass or plastic bottles protects your product from light. Any bottle that is clear will not be protected.
The antioxidants could become useless in a matter of days depending on the ingredient. You are then wasting your money on a product that now has little benefits for the skin.
An opaque airless bottle is the only way to protect from both light and air! Check your bottles today!