When to Throw Out Makeup (Most People Keep It Way Too Long)
⏱️ Estimated reading time: 8 minutes
There's a jar of foundation in most people's bathrooms that's been there longer than they remember buying it. A mascara that's technically three months old but "still works fine." A lipstick from a different era of their life that they hold onto because the color is perfect. Most of us know, vaguely, that makeup expires — but the specific timeline is fuzzy, the consequences feel abstract, and throwing out a mostly-full product feels wasteful.
The problem is that "expired makeup" isn't one category with one level of risk. An expired mascara is a genuine infection risk with a documented link to serious eye problems. An expired pressed powder eyeshadow is almost no risk at all — the product simply gets less pigmented and the texture changes. Knowing which products carry real consequences versus which are mostly a quality issue changes the calculus significantly: you can let some things go longer and you should throw others out immediately, and a generic "replace everything every year" rule doesn't tell you which is which.
This guide covers both: the PAO symbol that most people have never read correctly, and a category-by-category breakdown that pairs the timeline with the actual risk and the warning signs that tell you a product has turned regardless of how long you've had it.
The PAO Symbol — What It Actually Means
Most makeup packaging carries a small symbol that looks like an open jar with a number inside it — 6M, 12M, 24M. This is the Period After Opening (PAO) symbol, and it tells you how many months the product is safe and effective to use after you first open it. It is not a use-by date from manufacture. It is not a best-before date from purchase. It starts the clock from the first time you open the product.
The number inside the open jar — 6M, 12M, 24M — is months after first opening, not months from purchase or manufacture. A foundation labeled 12M is safe for 12 months from the day you first opened it, regardless of when you bought it or when it was made. If you stockpile products or buy multiples on sale, the clock doesn't start until the seal is broken — which means an unopened product in ideal storage conditions can last significantly longer than the PAO suggests.
Two practical implications of the PAO that most people miss: first, if you can't remember when you opened something, that itself is a signal — write the month and year on the bottom of a product with a marker when you open it. Second, products without a PAO symbol (common in many cosmetics, particularly powders) don't have a regulatory-mandated expiration indicator, which shifts the assessment entirely to warning signs rather than a timeline.
Makeup expires for two reasons, and understanding which one applies to a product tells you how much the expiration actually matters. The first is microbial contamination: products that contain water (liquid foundations, mascaras, cream blushes, lip glosses) are hospitable environments for bacteria, mold, and yeast, which multiply over time and can cause infections, breakouts, or allergic reactions. The second is oxidation and ingredient degradation: products change chemically as they age — oils go rancid, SPF actives lose efficacy, pigments shift — affecting quality and performance but not safety. High-risk products are almost always in the first category. Low-risk products are typically in the second.
High-Risk Products: Throw These Out on Schedule
These are the products where expiration carries genuine health consequences — eye infections, skin infections, or allergic reactions — not just a quality decline. The timelines here are not suggestions.
The wand is inserted into a wet, dark, oxygen-limited tube — ideal conditions for bacterial growth. Every use introduces bacteria from the eye area back into the tube. The pump-and-twist application spreads that bacteria throughout the formula. Three months is the medically supported replacement interval, consistently recommended by ophthalmologists.
Dried-out formula, flaking on application, a sour or unusual smell, and any eye irritation after use. If you've had a stye or eye infection while using a mascara, replace it immediately — the bacteria that caused the infection is now in the tube. Never pump the wand to add air; it accelerates drying and bacterial growth.
Applied to the lash line — extremely close to the eye — using an applicator that contacts both the product and the eye area repeatedly. Gel liners in a pot are particularly high-risk because fingers or brushes transfer bacteria directly into the product with every use. Liquid liner with a fine-tip applicator has slightly lower contamination risk but the same proximity concern.
Formula change in texture or smell, any eye irritation or redness after application. Pot gel liners should be cleaned at the top layer with a clean spatula periodically. Never use a gel liner directly from the pot with fingers — a dedicated clean brush extends the product's safe life and reduces contamination.
Water-based liquid foundations are hospitable to bacterial growth. Pump bottles are the safest format — the pump mechanism minimizes air and bacteria entering the product. Wide-mouth jars are the riskiest because fingers or brushes introduce bacteria directly. Oil in the formula goes rancid over time regardless of contamination, producing an off smell. SPF-containing foundations lose active protection efficacy as they age.
Change in smell (sour, rancid, or chemical), separation that doesn't re-blend with shaking, change in texture (thicker, thinner, or grainy), and any skin breakouts or irritation that correlates with a specific product. Foundations that have clearly separated and won't re-emulsify should be discarded regardless of age.
Same water-based contamination concern as liquid foundation, with the added risk of under-eye and spot application — areas of thinner, more permeable skin. Wand-applicator concealers that touch the skin directly and are returned to the tube carry higher contamination risk than pump or doe-foot applicators used with a separate brush.
Smell change, texture thickening or separation, and any skin reaction at application sites. If using a wand applicator, consider dispensing product onto the back of your hand and applying from there rather than applying directly with the wand — it significantly extends the safe life of the product by reducing back-contamination.
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Medium-Risk Products: Watch for Warning Signs
These products carry lower contamination risk than the high-risk category — usually because they contain less water, are in less-permeable formats, or are applied away from the eyes — but they do degrade meaningfully over time and can cause skin reactions when well past their prime.
The oils and waxes in lipstick go rancid over time — the primary degradation is smell and texture rather than bacterial contamination, since lipstick has minimal water content. The exception is if a lipstick has been used while you had a cold sore — herpes simplex virus can survive on the product surface and reinfect at later use.
A distinctly waxy, crayon-like, or rancid smell; a white coating on the surface (not to be confused with a bloom, which is harmless); a change in texture that makes it apply unevenly. A white bloom that wipes away cleanly is just oils migrating to the surface — it's cosmetically unpleasant but not harmful.
Lip gloss contains more water than lipstick, which increases bacterial contamination risk. The wand applicator contacts the lips and returns to the tube with every use — the same back-contamination concern as mascara, though at lower risk because the lips are less infection-prone than the eye area.
Smell change, stickiness that's different from the original formula, separation of the formula, or any lip irritation. If you share lip gloss — which transfers more product than lipstick — shorten the replacement interval regardless of how old the product is.
Cream formulas contain water and oil — both subject to contamination and rancidity respectively. Stick formats have lower contamination risk than pot formats because the product isn't directly exposed to tools or fingers. Applied to cheeks and temples rather than eyes, which lowers the infection consequence if contaminated.
Smell change, texture change (particularly if the cream becomes grainy or separated), and breakouts at consistent application sites. Any cream product in a pot that is used with fingers rather than a clean brush should be replaced sooner — finger application is the fastest route to contamination.
The active UV-filter ingredients in SPF products — both chemical and mineral — degrade over time and lose their protective efficacy. A foundation labeled SPF 30 may deliver significantly less protection after 12 months, particularly if stored in a warm environment. The contamination risk follows the base formula; the SPF adds a specific safety dimension beyond cosmetic quality.
The degradation of SPF actives is not visible or smellable — it's chemical. The practical approach: treat any SPF-containing makeup as having a firm 12-month post-opening limit regardless of how the product otherwise looks or smells, and never rely on makeup as the sole source of sun protection in any case.
Low-Risk Products: These Last Longer Than You Think
These products have minimal water content, are less hospitable to bacterial growth, and tend to degrade in quality long before they become a health concern. The warning signs here are mostly about performance rather than safety.
Powder products contain virtually no water, which means bacteria cannot multiply in them. The primary degradation is the binding agents that hold pressed powders together — they break down over time, causing the powder to become more difficult to pick up on a brush, crumble, or develop hard patches from oil transfer. This is a quality issue, not a safety issue.
Hard glazed surface (caused by oil from skin transferring onto the powder), crumbling that wasn't there at purchase, and reduced pigment payoff. The glazed surface can be removed by scraping the top layer off with a clean tissue — it restores the texture beneath. Replace when the product stops performing as expected, not necessarily on a set schedule.
Powder eyeshadow is one of the longest-lasting makeup products because it has no water content, is applied with a brush that can be kept clean, and is not applied to a mucous membrane. The primary degradation is pigment and texture. An eyeshadow palette that's two or three years old and still applies smoothly with good color payoff is not a health risk.
Reduced pigment payoff, a hard glazed surface from oil transfer (particularly if you apply eyeshadow with fingers rather than a brush), or fallout that's excessive relative to when the product was new. Clean eyeshadow brushes regularly — dirty brushes transfer oil onto powder products and accelerate the glazing that shortens their effective life.
Pencil eyeliners can be sharpened — which removes the contaminated outer surface and exposes fresh product with every sharpen. This makes them significantly lower-risk than liquid or gel liners despite being applied to the same eye-adjacent area. Sharpening is a built-in hygiene mechanism that liquid liner doesn't have.
Sharpen before every use — it's hygiene as much as it is maintenance. If the pencil is difficult to sharpen cleanly or the product crumbles rather than draws, it's past its useful life. A sharp pencil that applies smoothly can be used up to its PAO guideline with confidence.
The Universal Warning Signs That Override Any Timeline
Regardless of how recently you opened a product or what the PAO says, these signs mean it should be discarded immediately.
- Any change in smell. Rancid, sour, chemical, or simply "off" — if a product smells different from when you opened it, the formula has changed. This applies to all product categories.
- Visible mold, unusual color change, or visible separation that doesn't re-emulsify. These are signs of microbial contamination or significant chemical breakdown. Do not use.
- Any skin or eye irritation that correlates with a specific product. If you develop a rash, breakout, redness, or eye irritation after using a specific product and it wasn't there before, the product is the suspect. Stop using it immediately and don't restart unless you've ruled it out definitively.
- Any product used during an eye infection, cold sore, or skin infection. These should be discarded immediately — the product is now contaminated with the pathogen that caused the infection and will reinfect at next use.
- Any product that's been stored in a car, a very warm bathroom, or in direct sunlight for extended periods. Heat dramatically accelerates all degradation — microbial, oxidative, and SPF active breakdown. Products stored in high heat should be treated as expiring faster than the PAO suggests.
How Storage Affects Shelf Life
The PAO guidelines on packaging are based on assumed normal storage conditions — cool, dry, away from direct sunlight. The way most people actually store makeup (on a bathroom counter near a shower, in a makeup bag left in a warm car, on a sunny windowsill) accelerates every form of degradation significantly. Temperature fluctuations drive the bacteria-hospitable warm conditions that shorten high-risk product life. Humidity from a shower creates a moisture-rich environment that water-containing products absorb. Direct sunlight drives oxidation and SPF degradation faster than any other factor.
- Keep makeup out of the bathroom if possible. The humidity cycle from showers is one of the fastest routes to bacterial growth in water-containing products. A bedroom vanity or drawer is a meaningfully better storage environment.
- Avoid direct sunlight. UV exposure degrades SPF actives, drives oxidation in oils, and shifts pigment colors over time. A closed drawer or opaque bag protects against this.
- Clean brushes and tools regularly. Dirty brushes transfer oil and bacteria into powder products and extend microbial contamination to products that might otherwise last. Weekly cleaning for frequently used brushes is the practical standard.
- Mark opening dates. A marker on the bottom of the package with the month and year you opened it takes ten seconds and removes all the guesswork from every timeline in this guide.
For the skincare products that support and interact with makeup — and that have their own expiration and storage considerations — the skincare routine guide covers product selection and layering in detail. And for a broader look at how to edit and maintain a beauty product collection rather than letting it accumulate indefinitely, the makeup bag edit guide is the practical declutter companion to this one.
Frequently Asked Questions
Yes, but much more slowly than opened makeup, and the expiration concern shifts almost entirely from contamination to quality degradation. An unopened, sealed product stored in good conditions can remain safe and effective significantly past its PAO guideline — because the PAO clock starts at opening, not manufacture. The concern for truly long-term storage (several years) is primarily formula separation, SPF active degradation, and oil rancidity rather than microbial contamination. Practically: an unopened mascara from two years ago is probably fine once opened — but use it within three months of opening, as usual. An unopened foundation from three years ago may have separated or have degraded SPF, but it isn't a contamination risk until it's opened and exposed to air and use. Check for smell and texture changes on first use of any very old stored product.
Yes — this is one of the better-documented risks in cosmetic microbiology. Studies have found bacterial contamination rates in mascara that increase significantly beyond the three-month mark, with organisms including Staphylococcus aureus, Pseudomonas aeruginosa, and others that can cause conjunctivitis, keratitis, and more serious eye infections in vulnerable individuals. The risk is particularly elevated for contact lens wearers, whose lenses can trap contaminated mascara particles against the eye. Three months is the guideline that ophthalmologists consistently recommend, and it's one of the few makeup expiration timelines with meaningful clinical data behind it rather than just manufacturer recommendation. If you've ever had a stye or eye infection while using a particular mascara, that mascara should have been discarded at the time of infection — using it after recovery reintroduces the pathogen.
It depends entirely on the product category. For low-risk powder products — eyeshadow, pressed powder, powder blush — the answer is generally yes. If the product applies well, smells fine, and hasn't developed a glazed surface or visible mold, it's almost certainly safe to continue using past a PAO guideline. For high-risk water-containing products — mascara, liquid foundation, liquid eyeliner — the answer is more cautious. Bacterial contamination in these products is not always visible or smellable in its early stages; the look-and-smell test is a trailing indicator, not a leading one. Mascara specifically should be replaced at three months regardless of how it appears, because the contamination risk at the eye is significant enough that the cost of a new mascara is trivially low compared to the risk of an eye infection.
Many cosmetic brands use a batch code on the packaging — typically a string of letters and numbers stamped or printed on the bottom or back of the product. Several websites (CheckFresh and BatchCode are two commonly used ones) allow you to enter this code and retrieve the manufacture date for many brands. This is useful for products bought in bulk or found in storage. That said, the manufacture date is less actionable than the opening date for most purposes, since the PAO clock starts at opening. The most practical approach: mark the opening date on products yourself when you open them, rather than trying to reconstruct manufacture and purchase dates after the fact.
For some products, yes — with caveats. Refrigeration slows bacterial growth and oil rancidity, which genuinely extends the safe life of water-containing products like liquid foundation, concealer, and cream products. Eye creams and vitamin C serums from skincare also benefit from refrigeration for similar reasons. The caveat: temperature fluctuations — taking a cold product into a warm room repeatedly — can cause condensation inside the packaging, which actually accelerates microbial growth. If you refrigerate makeup, it works best for products that stay cold until use, rather than ones that go in and out of the fridge daily. Powder products gain nothing from refrigeration. A dedicated small cosmetic refrigerator set at a consistent temperature is more beneficial than a bathroom storage solution and is worth considering for high-value skincare and liquid makeup if you have the space.
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