Unravel the Mystery: How Long Does Sunscreen Last on Your Skin and in the Bottle?
How does a sunscreens longevity impact your skins protection from the sun?
How does a sunscreens longevity impact your skins protection from the sun?
As we move into warmer weather, sun protection becomes more important. The skin is your bodies’ largest organ; caring for your skin is critical to your overall health and that includes protecting it from the sun. Not only does sun protection prevent skin cancer, but it also protects the skin from premature aging.
Skin cancer is the most common cancer in the United States, with over 5 million cases diagnosed each year with UV radiation from the sun being responsible for 90% of non-melanoma skin cancers. UV radiation can also cause wrinkles, age spots, and can accelerate the loss of elastin and collagen resulting in leathery, rough skin.
How long does sunscreen really provide protection on your skin? And how long does sunscreen last in its container? Let's dive into the science behind sunscreen and unravel the mystery behind sunscreens longevity.
Sunscreen Effectiveness on the Skin
The duration of effectiveness for sunscreen varies based on several factors such as the SPF level (we recommend SPF 30), your activity level, and your skin type. The general rule of thumb (FDA recommended) is to reapply every two hours or after swimming or sweating (read your water-resistant sunscreen for exact protection, usually 40 to 80 minutes).
Water resistance is also a factor to consider when it comes to sunscreen longevity. Sunscreen can be labeled as "water-resistant," but this doesn't mean that it's waterproof. It simply means that it provides protection for a certain amount of time while swimming or sweating. Each water-resistant’ sunscreen is different so read the label to understand how long your coverage will last. The best practice is to reapply after any heavy sweating or water activities to maintain adequate protection.
Sunscreen Shelf Life
Sunscreen is considered an over-the-counter drug and as such the FDA regulations require all sunscreens to have an expiration date unless the manufacturer conducts stability tests proving that the product will remain stable for at least three years. If your sunscreen does not have an expiration date, consider it expired after three years.
The expiration date is there to safeguard the users; expired product may no longer be fully effective. The expiration date assumes you are storing the product properly. Be sure to look for other signs that your sunscreen has expired including changes in color, a watery consistency, separation, or lumps or grittiness. These are all signs your sunscreen has lost its effectiveness and are cause for throwing the product away.
Ironically, sunscreen breaks down when exposed to heat and direct sunlight making proper storage crucial for maintaining its effectiveness. Keep your sunscreen in a cool, dry place away from direct sunlight. Exposure to heat and sunlight can degrade the active ingredients making it less effective.
The Importance of Understanding Sunscreen's Longevity
Understanding how long sunscreen lasts on your skin and in the container is crucial for ensuring maximum sun protection. Using expired or ineffective sunscreen can put you at risk for skin damage and cancer. By following proper application and storage techniques, you can ensure that it is effective and protective.
Subscribe to our newsletter to keep up with The Buzz on topics from sun care to sustainable living and share this article with friends and family to share the importance of sun protection. Remember that a small amount of sunscreen goes a long way in protecting your skin and promoting overall skin health.
