Does sunscreen expire? Everything you need to know about shelf life and safety
We all know the golden rules of sun protection: use a broad-spectrum SPF 30 (or higher) every day, and reapply it every two hours no exceptions. But there's one often-overlooked detail that could be sabotaging your sun safety efforts: the expiration date on your sunscreen bottle.It's easy to ignore, especially when the product looks and smells fine. But just like any other skincare product, sunscreen has a shelf life and using it past that point can come with serious consequences. Below, skincare expert Shaily Mehrotra, founder of FCL Skincare, explains why you should pay close attention to expiration dates and how to maximise your sunscreen's lifespan.advertisementCHEMICAL VS. MINERAL SUNSCREENS: WHICH LASTS LONGER?When it comes to shelf life, mineral sunscreens (also known as physical sunscreens) tend to have the upper hand. These typically contain zinc oxide or titanium dioxide, ingredients that remain stable even when exposed to light. Chemical sunscreens, on the other hand, rely on molecules that can break down and oxidise over time, reducing their efficacy.That said, both types are generally formulated to last up to three years, as long as they're unopened and stored properly, away from heat and sunlight.WHY DOES SUNSCREEN EXPIRE?'All skincare products eventually degrade, and sunscreen is no exception,' says Shaily. Over time, active ingredients lose their potency, making the formula less effective or completely ineffective at shielding your skin from harmful UV rays.HOW LONG DOES SUNSCREEN LAST AFTER OPENING?In addition to the printed expiration date, many sunscreens also carry a 'period after opening' symbol. This tells you how many months the product remains safe to use after it's been opened, which is typically 6 to 12 months.CAN YOU USE EXPIRED SUNSCREEN?advertisementTechnically, if the product has been stored in ideal conditions and doesn't show signs of spoilage, it might still offer some protection. However, Shaily cautions against it.'Even if it looks okay, expired sunscreen isn't reliable,' she warns. 'It may not protect against UV damage and could irritate your skin.'WHAT HAPPENS IF YOU USE EXPIRED SUNSCREEN?Using expired sunscreen can leave your skin vulnerable to sunburn, premature ageing, and even skin cancer. Once past its expiration date, the formula may separate, meaning the UV filters won't distribute evenly, leaving parts of your skin exposed.Expired formulas can also harbour bacteria or yeast, leading to irritation, rashes, or breakouts. 'The chemical stability, texture, and safety of the product are all compromised,' adds Shaily.Bottom line: if in doubt, toss it out.HOW TO STORE SUNSCREEN FOR MAXIMUM SHELF LIFEProper storage makes a big difference. Keep sunscreen in a cool, dry place, away from direct sunlight. 'Heat and light can cause some formulas to break down faster,' says Shaily. 'A drawer or cabinet at room temperature is ideal—better yet, choose a cool, dark spot.''Sunscreen expiration dates are there for a reason,' Shaily emphasises. 'They're not just about UV protection—they also ensure the product's texture, stability, and sterility remain intact.'So before you head out into the sun, give your sunscreen a quick check. Your skin will thank you.
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