Sunscreen does not need to be stored in the refrigerator or freezer for extended periods of time. In fact, it is generally recommended to store sunscreen at room temperature. Storing sunscreen in extreme temperatures, such as in the refrigerator or freezer, can actually be detrimental to its effectiveness and stability.
Here are some guidelines for storing sunscreen:
Room temperature: Sunscreen should be stored at room temperature, typically between 68°F to 77°F (20°C to 25°C). Avoid exposing it to direct sunlight or high temperatures, such as leaving it in a hot car, as extreme heat can degrade its active ingredients.
Cool and dry place: Keep sunscreen in a cool and dry place, away from direct sunlight and moisture. Bathrooms, where humidity levels can be high, are not ideal storage locations for sunscreen.
Check expiration date: Always check the expiration date on the sunscreen bottle. Expired sunscreen may not provide adequate protection, and its effectiveness may have diminished over time.
Shake well if needed: Some sunscreens may require shaking before use to ensure even distribution of the active ingredients.
Travel considerations: If you're traveling and the weather is very hot, consider storing the sunscreen in a small insulated bag or cooler to prevent overheating.
Extreme temperatures, whether too hot or too cold, can cause changes in the sunscreen's formulation, affecting its efficacy. For instance, freezing temperatures could cause the ingredients to separate or become less effective. Additionally, extreme cold can alter the texture of the sunscreen, making it difficult to apply smoothly.
If you find that your sunscreen has been exposed to extreme temperatures or has changed in appearance, texture, or smell, it's best to replace it with a new bottle to ensure you are adequately protected from the sun's harmful UV rays. Regularly using sunscreen with proper storage and within its expiration date will help ensure its effectiveness and provide you with the best sun protection.