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" Do a quick check of any woman&amp;#039;s bathroom, and chances are you&amp;#039;ll find jars of rarely used face cream, the dregs of a favorite powder blush, and at least one tube of lip gloss squeezed within an inch of its life. Whether unused, or consumed to the last drop, squeeze, or swipe, these cosmetics are taking up shelf (and makeup-bag) space because we want to get every penny out of the precious dollars we spent on them. But this hoarding habit has a catch: Beauty products do go bad. At best, they stop performing as well as they used to; at worst, they can cause irritations or infections. &amp;quot;Unopened, well-formulated cosmetics can remain stable for a couple of years at room temperature,&amp;quot; says Ni&amp;#039;Kita Wilson, a cosmetic chemist at Cosmetech Laboratories in Fairfield, NJ. &amp;quot;But the clock starts once you bring a product home and open it. When air hits the formula, certain ingredients start to oxidize and degrade.&amp;quot; What&amp;#039;s more, every time you touch your makeup or skin-care lotions and potions, you transfer germs to them \u2014 and, subsequently, to your face. Heat and humidity, which promote the growth of mold and yeast, are factors, too. That&amp;#039;s one reason the bathroom, though convenient, isn&amp;#039;t the ideal spot to store cosmetics. (High levels of airborne bacteria can contaminate beauty products, too.) A better place: a cool, dry linen closet. Beyond the obvious signs \u2014 dried mascara or separated foundation \u2014 it can be tough to tell when something&amp;#039;s past its prime. (U.S. labeling regulations don&amp;#039;t require an expiration date on most cosmetics.) So read on for easy, expert, beauty-protecting tips on when to throw away what.      Face Makeup Toss-it time: Six months for liquids; two years for powders Insider info: You increase the odds of bacterial growth \u2014 and, hence, of breakouts or irritation \u2014 when you repeatedly dip your brushes and fingers into liquid foundation. Also, as it ages, foundation can go on unevenly, creating a streaky, inconsistent finish. &amp;quot;Oils rise to the top, and the consistency thickens,&amp;quot; explains New York City makeup artist Mathew Nigara. Powders present less of a problem because bacteria can&amp;#039;t grow where there&amp;#039;s no water. However, over time, powders with botanical ingredients like aloe or jojoba can become harder to blend and are more likely to crumble, as their trace amounts of water evaporate. Mascara Toss-it time: Three months Insider info: &amp;quot;A mascara tube is a dark, wet environment \u2014 the perfect breeding ground for bacteria,&amp;quot; says New York City optometrist Andrea Thau, O.D. &amp;quot;Preservatives in a mascara only work for so long.&amp;quot; Dr. Thau knows from firsthand experience: She once developed a sty from a makeup artist&amp;#039;s mascara wand. Plus, three-month-old mascara is a nonperformer. &amp;quot;It&amp;#039;s chalky and powdery, and any lengthening or thickening fibers often separate from the fluid, so the mascara stops going on in a smooth, even coat,&amp;quot; says makeup artist Cristina Bartolucci. To avoid hastening the demise of your mascara, never pump the wand \u2014 that pushes air into the tube, causing it to dry out faster. Instead, slowly draw out and twist the brush to scrape the tube&amp;#039;s interior and pick up product. Eyeliner and Eye Shadow Toss-it time: Liquid eyeliners, three months; cream eye shadows, six months; pencil eyeliners and powder eye shadows, two years Insider info: As they do with mascara, bacteria tend to flourish in liquid-eyeliner tubes, and the product dries out. Pencil eyeliners have a longer shelf life because you can create a fresh, clean surface each time you sharpen them. (Just be sure to regularly sanitize your sharpener with rubbing alcohol.) Powder shadows, like pressed powders, are less prone to contamination because they, too, lack water (if you wet them, toss after six months). But aging eye shadows have performance issues: They get packed down, making it harder to pick up pigment with your brush, says Bartolucci. Lipstick and Lipliner Toss-it time: Lipstick and gloss, two years; lipliner, two years or more Insider info: Lipsticks&amp;#039; water content makes them potential mini reservoirs of bacteria. No surprise, they also dry out with age, says New York City makeup artist Tina Turnbow: &amp;quot;They no longer look creamy on the lips.&amp;quot; Long-wearing formulas may have an even shorter life span since they often contain ingredients that evaporate more quickly than creamier formulas. Pencil lipliners, like eyeliners, may last a little longer since putting them through a sharpener removes the old surface. Next:   Nail Polish  Toss-It Time: One to two years   Insider info: When polish expires, the consistency turns gooey or stringy, says Ji Baek, owner of Rescue Beauty Lounge in New York City. Formulas are especially sensitive to temperature extremes and humidity, so avoid storing in the bathroom.  Skin Care  Toss-it time: Acne creams and other over-the-counter products that contain drugs are FDA regulated and usually carry expiration dates. But cosmeceuticals (products claiming to have anti-aging and skin-changing benefits) are not regulated, and once they&amp;#039;ve been used, they shouldn&amp;#039;t be kept for more than six months \u2014 or, if they&amp;#039;re in pump bottles, a year \u2014 says Wilson.   Insider info: &amp;quot;Some ingredients [such as vitamin C, retinol, and hydroquinone] degrade even more rapidly if they&amp;#039;re left in direct sunlight or exposed to air,&amp;quot; says Tina Alster, M.D., a Washington, D.C., dermatologist. Less frequently \u2014 but more alarmingly \u2014 certain products can actually become more potent over time, says Boston dermatologist Ranella Hirsch, M.D. The reason: Active ingredients like retinol and glycolic acid become more concentrated as their bases degrade, separate, or evaporate. And when proportions change, your skin may get irritated. To prevent problems, store cosmetics properly, discontinue use after six months, and look for products that come in a pump, which helps keep air out. Another option that&amp;#039;s starting to hit shelves: special jars that dispense creams through a tiny hole or slit when you press the top (an internal &amp;quot;floor&amp;quot; rises with each push). Sunscreen Toss-it time: Six months   Insider info: Sunscreens are FDA regulated, and though they usually have expiration dates of at least one year, that date indicates the purchasing time frame, says Wilson: &amp;quot;When you open a tube, water may start evaporating, causing the formula to eventually become unstable. Once that happens, the ingredients are no longer evenly distributed, so you may get a lot in one dose, but nearly none in another.&amp;quot; Protect your tube by storing it out of the sun. Hair Products Toss-it time: One year   Insider info: Always close the caps of shampoos, conditioners, and styling products tightly. Otherwise, water and air can get in, breaking down the formulas or causing them to separate. (Good news for hairspray users: Aerosol cans are the best product protectors going, so sprays should stay good even longer.) Fragrance Toss-it time: Two years \u2014 or potentially many more   Insider info: &amp;quot;Eau de toilettes and perfumes can last for several years, as long as they&amp;#039;re kept out of humidity and sunlight,&amp;quot; says Robert Gerstener, co-owner of Aedes de Venustas, a New York City fragrance emporium. &amp;quot;Both of these elements can alter notes in a fragrance, which will then change the overall scent.&amp;quot;  Simple Stay-Fresh Secrets  Wash and dry your hands thoroughly before putting your fingers into a product.  Avoid reinfection. Stop using all eye makeup if you have an eye infection and lip products if you have a cold sore. The exceptions: lipsticks, lipliners, and eye pencils, which can be shaved clean with a knife or sharpener. (Just cleaning with a tissue won&amp;#039;t suffice.) Smell your mascara when you first purchase it. If you recognize that scent, you&amp;#039;ll know when it goes bad: Expired mascara often takes on a funny, chemical odor. Choose a cotton-tipped swab or disposable sponge to apply makeup to a pimple \u2014 and avoid double-dipping. Going back and forth from the product to the affected area with your finger or a sponge can lead to contamination. Try Timestrips, www.timestrip.com), stickers that &amp;quot;remember&amp;quot; when a product was first opened and alert you when it&amp;#039;s no longer wise to use it.  What About Natural Products? For starters, they may have an extra-short shelf life, according to the FDA, because their botanical ingredients may be susceptible to microbial growth. (Think pure extract, oil, pulp, rind, or bark of plants, fruits, trees, or leaves.) What&amp;#039;s more, though natural preservatives like essential oils of cinnamon, orange, rosemary, and thyme can be potent, when used at low levels they may not be as strong as synthetics, says Wilson. An added problem for consumers: There&amp;#039;s no way to know how &amp;quot;natural&amp;quot; a product is, since the term is undefined and unregulated. If you&amp;#039;re a natural fan, consider contacting the manufacturer about specific cosmetics. &amp;quot;Most reputable companies put their products \u2014 &amp;#039;all natural&amp;#039; or not \u2014 through a microbial challenge,&amp;quot; says Wilson. Request the test results. (If the customer-service rep doesn&amp;#039;t supply them, ask to speak to the technical team.) Your When-to-Toss-It Timeline Every season: Toss your mascara and liquid liner   Every six months: Toss your skin-care regimen, sunscreens, and liquid foundation   Every year: Toss your hair products (except hairspray)   Every two years: Toss your powder-based cosmetics (such as pressed powder and shadows), lipsticks, and nail polishes More from Good Housekeeping: Latest Hair Colors &amp;amp;amp; Hair Color Ideas 24 Short Hairstyles for Women Lovely Long Hairstyles You&amp;#039;ll Love 22 Blonde Hair Colors This Season "^^<http://www.w3.org/2001/XMLSchema#string>
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