When does sunscreen expire and how long does it last?

Hello! I've been grappling with a question recently about the shelf life of sunscreen and how long it remains effective on the skin. After some research and personal experience, I'd like to share my insights in the hopes that it might be helpful.
Shelf Life: Firstly, you can typically find the shelf life of sunscreen indicated on its packaging. They are usually labeled with a symbol resembling an open jar and mention the number of months, such as 12M for 12 months or 24M for 24 months. This means that it should be usable for that duration after you've opened the bottle under normal conditions. However, there are additional factors that can affect the lifespan of sunscreen. How you store it is crucial. It's best to keep it in a cool place, away from direct sunlight, as exposure to sunlight and high temperatures can cause its ingredients to degrade. Additionally, make sure the cap is tightly closed to prevent air and bacteria from getting in. If your sunscreen develops an unusual odor, changes in consistency, or becomes uneven, it's advisable to discontinue its use as it may have lost its effectiveness in protecting your skin. Moreover, if you haven't used up a bottle of sunscreen within some time after its expiration date, it's best not to use it, as its protective efficacy may significantly decrease. Duration of Effectiveness: The duration sunscreen remains effective depends on several factors, including its SPF level, your activity level, and exposure to sweat or water. Generally, it's recommended to reapply sunscreen every 2 hours or immediately after swimming or engaging in physical activities. When you're outdoors in the sun, especially during hot summer days, frequent reapplication is crucial to ensure long-lasting protection. In my personal experience, prolonged exposure to sunlight, sweat, or swimming can reduce the effectiveness of sunscreen. So, regular checks and reapplication are key to ensuring your skin stays well-protected. I hope these insights are helpful to everyone. Please remember that this is my personal experience and not professional advice. If you have serious skin concerns, it's best to consult a dermatologist for proper treatment. And always remember, protecting your skin from UV damage is highly important! If you have more questions or experiences to share, feel free to leave a comment for further discussion. #skincare#beauty#eyemask #eyepatch#eyecream#viicode#ESS#eastsuperstar VIIcode blog: https://viiblog.com/index.php?route=blog/category&blog_category_id=3 Photo from: https://www.pexels.com/zh-cn/photo/8157149/

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