Klairs Skin School

How to Stock Up on Skincare During Holiday Sales Without Wasting It

Holiday sales are a good time to restock the skincare you use every day. The catch is that skincare has a clock, and it starts ticking the day you open it. Here's how to stock up so every bottle gets used up, not thrown out. Two dates to check before you stock up Expiration (unopened). How long the product keeps before you open it. On Dear, Klairs product pages this is listed as, for example, “EXP: 36M from MFD” — up to 36 months from the manufacturing date while sealed. PAO — period after opening. The small open-jar symbol with a number such as “12M”. It means the product is best used within 12 months of opening. Most of our daily basics list “PAO: 12M”. So a sealed backup can wait on the shelf, but once it's open, the 12-month countdown starts. More on dates and symbols in how long does skincare last? What's worth stocking up on The best candidates are products you already use daily, already know your skin likes, and finish on a regular rhythm: Your everyday toner. A hydrating toner you pat in morning and night goes fast. For example, the Supple Preparation Unscented Toner (PAO 12 months). Your go-to moisturizer. If you've finished more than one jar of the same cream, a backup is low-risk — like the Midnight Blue Calming Cream for red, reactive days, or the Rich Moist Soothing Cream for dry, colder months. Your cleanser. Simple, used twice a day, and easy to predict. What to buy one at a time Vitamin C serums. Vitamin C reacts with air, light and heat, so the color can deepen over time once it's open. For our Freshly Juiced Vitamin Drop, the PAO is 12 months, but for the best vitamin C effect we recommend using it within 6 months of opening. Buy the next one when you're close to finishing. Anything you haven't tried yet. A sale isn't the moment to buy three of something new. Try a travel size first (see travel-size skincare for the holidays) and patch test. Sunscreen. Check the expiration date, and buy what you'll use this season rather than next year's supply. Strong actives you use occasionally. Exfoliating acids or retinoids used a few times a week last longer than you expect — one is usually enough. How many should you buy? Work it out from your own routine, not the discount: Write the opening date on the next bottle you open (a small marker dot on the label works). Note when you finish it. That's your real usage rhythm. Buy only what you'll open within the next year, and make sure each one can be finished within its PAO after opening. If you finish a toner every couple of months, two or three backups is sensible. If a cream lasts you most of the year, one backup is plenty. How to store your backups Keep sealed products somewhere cool, dry and dark — a closet shelf, not a sunny windowsill or a steamy bathroom. Don't leave skincare in a hot car or next to a radiator. Keep caps and pumps closed tightly, and use clean, dry hands or a spatula for jars. Open backups in order — oldest first. Signs a product has turned Whatever the date says, stop using a product if its smell, color or texture changes, if it separates and won't mix back, or if it suddenly stings when it didn't before. Keeping your routine small makes stocking up easier. See a minimalist skincare routine for a simple starting point. FAQ Is it a good idea to stock up on skincare during Black Friday? Yes, for products you already use daily and know your skin likes — such as your toner, moisturizer and cleanser. Buy only what you'll open within about a year, and buy new or active products one at a time. What does PAO 12M mean on skincare? PAO means period after opening. “12M” means the product is best used within 12 months after you open it. Unopened products follow the expiration date instead. How long does unopened skincare last? Check the expiration date on the pack. Many Dear, Klairs products list “EXP: 36M from MFD” — up to 36 months from the manufacturing date while sealed. Store unopened products somewhere cool and dark. Should I stock up on vitamin C serum? It's better to buy vitamin C one at a time. Once it's opened, vitamin C reacts with air, light and heat. For Freshly Juiced Vitamin Drop, we recommend using it within 6 months of opening for the best vitamin C effect. How can I tell if skincare has gone bad? Look for a change in smell, color or texture, separation that won't mix back, or new stinging. If you notice any of these, stop using it. Note: figures come from cosmetic clinical/consumer studies measuring the appearance and feel of skin. They are not medical claims; individual results vary; not intended to diagnose, treat, cure or prevent any condition. Always patch test.