Can Makeup Expire? The Real Shelf-Life Rules
Every beauty article repeats the same tidy rules — three months for mascara, a year for foundation, two years for powder — but can makeup expire in any way the FDA actually regulates, or is the entire dating system something the industry invented on its own?
There is no US law or FDA regulation requiring cosmetics to carry a shelf life or expiration date at all. The familiar open-jar symbol with “12M” or “24M” printed on it is an EU labeling requirement, not an American one — US brands include it voluntarily because they also sell into European markets. The widely repeated “three months for mascara” rule traces to one specific source: a small 2008 pilot study of just 40 women and two mascara brands, not a large clinical trial or a dermatology-society standard.
A genuinely underused finding worth naming directly: contamination risk in eye makeup tracks hygiene habits — sharing product, dirty applicators, expired use — far more closely than it tracks the simple passage of time, which undercuts the idea that a fixed calendar date alone keeps anyone safe.
This guide covers what’s regulation versus convention, the real mechanisms behind why different product types degrade differently, a documented case of real eye infection from mascara use, and the actual signs a product has gone bad versus cosmetic changes that don’t matter.
Recommended Fresh Replacements for Expired Makeup
Fast Facts
- There is no US law or FDA regulation requiring cosmetics to carry an expiration date — the agency says so in its own guidance.
- The PAO “6M/12M/24M” jar symbol comes from an EU labeling rule, not an American one, though many US products carry it anyway.
- The famous “replace mascara every 3 months” rule traces back to a single small 2008 pilot study, not a clinical standard.
- Newer research suggests how you handle a product matters more than how many months have passed since you opened it.
In This Guide
- There Is No Official Expiration Rule
- The PAO Symbol Is an EU Rule, Not a US One
- Where the 3-Month Mascara Rule Actually Came From
- What Later Contamination Studies Actually Found
- Hygiene Matters More Than the Calendar
- A Real Infection, Not a Hypothetical One
- Why Vitamin C and Other Actives Break Down
- Why Foundation Separates
- Why Powder Lasts Longest — and How That Protection Fails
- Why Preservatives Eventually Run Out
- Shelf Life by Product Category
- Real Spoilage vs. Changes That Don’t Matter
- When Makeup Is Legally a Drug
- Common Questions
- The Bottom Line
There Is No Official Expiration Rule
Ask most people how long a mascara or foundation is good for and they will give a confident number: three months, a year, two years. Almost none of it comes from a regulator. The FDA states plainly that “there are no U.S. laws or regulations that require cosmetics to have specific shelf lives or have expiration dates on their labels.” Manufacturers must substantiate safety, but there is no mandated testing protocol for cosmetics the way there is for drugs under 21 CFR 211. The numbers repeated as gospel are industry convention and dermatologist opinion, not government standard.
The PAO Symbol Is an EU Rule, Not a US One
The little open-jar icon with “6M” or “12M” printed inside looks official, and many shoppers treat it as an FDA-mandated safety clock. It isn’t. That symbol comes from EU Regulation (EC) No 1223/2009, Article 19, which requires period-after-opening labeling only on products with a minimum durability of more than 30 months, and exempts items where reopening creates no real recontamination risk. The FDA does not require or regulate this symbol in the US at all; brands that sell into the EU simply keep one global label. A US product without the symbol isn’t unregulated — it may just be exempt.
Where the 3-Month Mascara Rule Actually Came From
The specific “three months” figure has a real origin, smaller than most people assume. Pack, Wickham, Enloe, and Hill published a 2008 pilot study in Optometry in which 40 women used unexpired, non-waterproof mascara daily for three months. Only 33 tubes were recovered and cultured, and 36.4 percent showed microbial growth, mostly Staphylococcus epidermidis, Streptococcus species, or fungi. The authors concluded a three-month schedule was reasonable, noting that “more frequent replacement may be warranted with further study.” That is the entire basis for a rule repeated across the industry as settled science: one small pilot study, not a large trial.
What Later Contamination Studies Actually Found
Two more recent studies complicate the picture rather than confirming it. Giacomel and colleagues surveyed 44 female students in 2013 and found 97.9 percent admitted to using expired makeup. Testing 40 mascara samples turned up Staphylococcus aureus in 79 percent and Pseudomonas aeruginosa, the organism behind the CDC case below, in 13 percent. A 2026 study by Aleksandraviciene and colleagues tested 71 eye-makeup samples and found a different profile: mostly Bacillus species and coagulase-negative staphylococci, with none of those dangerous organisms detected.
Hygiene Matters More Than the Calendar
Put the two studies side by side and a pattern turns up that a single “toss it after X months” rule can’t explain. Giacomel’s sample turned up the two organisms responsible for the worst eye infections; Aleksandraviciene’s turned up mostly low-virulence flora. Contamination is close to universal in used eye makeup, but a genuinely dangerous pathogen is not guaranteed, and it seems to depend more on hygiene habits than time elapsed. Sharing makeup or applying it with unwashed hands looks like a bigger risk than being weeks past a date.
A short gut-check helps more than memorizing a number:
Check the product type
Eye products carry more infection risk than lip or cheek products if they go bad.
Check your own handling habits
Shared it, dipped in with unwashed fingers, or left it in a hot car? Handling matters more than the date.
Check texture and smell
Clumping, separation, an off smell, or a different feel actually correlate with spoilage.
Check for a PAO symbol or purchase date
Use it as a loose tracking aid; it reflects EU testing conventions, not an FDA rule.
When in doubt on eye products, replace
The worst case is rare but serious, so err toward replacement when concerns line up together.
A Real Infection, Not a Hypothetical One
Skepticism about an overstated rule shouldn’t tip into dismissing the risk. The CDC documented a case of a 47-year-old Georgia woman who scratched her cornea with a mascara wand and developed a Pseudomonas aeruginosa infection; testing matched the strain to bacteria in her own tube. She was left with permanent vision impairment in that eye. It was only the ninth documented mascara-linked Pseudomonas eye infection since 1977 — genuinely rare, but genuinely real.
Why Vitamin C and Other Actives Break Down
Not every sign of aging in a product is a safety issue. L-ascorbic acid, the active form of vitamin C in serums and some color cosmetics, oxidizes on contact with air, light, and heat. SkinCeuticals’ consumer science explainer describes the sequence: clear or pale yellow shifting to dark yellow, orange, or brown, the texture thickening, and a sour smell developing.
Why Foundation Separates
Liquid foundation and concealer are oil-in-water emulsions, held together by emulsifiers that keep two liquids that don’t naturally mix suspended in each other. As emulsifiers break down over time, especially with temperature swings, the phases separate, showing up as a curdled top layer or a watery pool. This is a texture and stability failure, not a microbial one — shaking can sometimes re-homogenize it, though repeated separation signals the emulsion is breaking down for good.
Why Powder Lasts Longest — and How That Protection Fails
Pressed powders genuinely do last longer than liquids, and the reason is water, not magic. Microorganisms need free water to grow, and per Eurofins’ cosmetics-testing explainer, anhydrous powders typically have water activity below 0.6, a level that “almost eliminates the chance of microbial growth.” That’s why powders need no heavy preservative system and can stay stable for roughly two years. The catch: this depends on staying dry. A wet sponge dipped into pressed powder reintroduces water and can reactivate dormant spores in the formula, per the same source.
Why Preservatives Eventually Run Out
Water-based creams rely on added preservatives, such as parabens and phenoxyethanol, formulated to hold off microbial growth for a defined window after opening. That window is finite, not permanent. Finger-dipping introduces bacteria with every use and draws down the system further; water from a wet brush dilutes it directly. Once it is exhausted or diluted past its working concentration, the product becomes vulnerable even though it may look unchanged — the real variable is hygiene, not elapsed time.
Do
- Use a clean spatula instead of a finger for jars.
- Wash brushes and sponges regularly.
- Store products away from heat and steamy bathrooms.
Don’t
- Share mascara, eyeliner, or lip products with anyone else.
- Add water to a dried-out product to revive it.
- Keep using an eye product after any eye infection.
Shelf Life by Product Category
Conventional shelf-life numbers still function as a reasonable default — conventions grounded in real mechanisms, not mandates. The table below lays out typical figures alongside the reason behind each.
| Product | Typical Guidance | Why |
|---|---|---|
| Mascara / liquid eyeliner | 3 months | Wet, warm, reopened near a mucous membrane; from the Pack et al. pilot study |
| Liquid foundation / concealer | 6-12 months | Emulsion stability declines and preservatives deplete with air exposure |
| Cream products (blush, contour) | 12 months | Same separation risk as liquids, slowed by lower water content |
| Lipstick / lip gloss | 12-18 months | Wax base is more stable, but mouth contact adds contamination risk |
| Pressed powder / eyeshadow | 18-24 months | Low water activity limits growth unless reintroduced by a wet applicator |
| Loose powder / mineral makeup | 24 months or more | Lower moisture and less applicator contact than pressed formats |
Real Spoilage vs. Changes That Don’t Matter
The American Academy of Dermatology’s guidance draws a useful line between real spoilage and changes that are cosmetically different but not a safety issue.
| Change | Real Spoilage Sign | Cosmetic-Only, Doesn’t Matter |
|---|---|---|
| Texture | Clumping in mascara, crumbling in powder, a runny or thick liquid | Slightly duller sheen in a highlighter |
| Smell | A sour, rancid, or distinctly “off” odor | Fading of a fragrance note over time |
| Color | A foundation that has visibly separated into layers | A slight color drift in lipstick with unchanged texture |
| Feel on skin | Product that feels gritty or irritating on application | None — if it still feels the same, it likely still is |
When Makeup Is Legally a Drug
One category of makeup is required to carry a tested expiration date: any product labeled with an SPF claim, including tinted moisturizer or foundation with sunscreen built in, is legally a drug in the US, not just a cosmetic. Drugs fall under 21 CFR 211, which mandates stability testing and dating, unlike plain cosmetics. So a foundation with an SPF number and a printed date is doing real regulatory work; a plain lipstick with no date isn’t a labeling gap, it’s an accurate reflection of the law.
Common Questions
Does the FDA require an expiration date on makeup?
No, except for products that are also legally drugs, such as SPF-labeled foundation.
What does the PAO symbol actually mean?
It is an EU labeling requirement showing months good after opening; the FDA doesn’t regulate it in the US.
Is the 3-month mascara rule an official standard?
No. It comes from a single 2008 pilot study of 40 women finding 36.4 percent of tubes contaminated at three months.
Can expired mascara actually cause an eye infection?
Yes, though rare. The CDC documented a corneal Pseudomonas infection traced to a woman’s own tube after wand trauma.
Does old makeup always contain dangerous bacteria?
Not necessarily. One study found high rates of dangerous bacteria in expired mascara; a newer study found mostly low-virulence organisms.
Why does foundation separate over time?
It’s an emulsion held together by emulsifiers; as those break down, oil and water phases separate into a curdled layer.
Why does powder makeup last so much longer than liquids?
Low water activity limits growth, but a wet brush or sponge can reintroduce moisture and undo that protection.
Is discolored vitamin C serum dangerous to use?
No. Per SkinCeuticals, oxidized vitamin C is simply less effective, not unsafe.
Does sharing makeup increase infection risk?
Yes. Research points to hygiene habits, including sharing products, as a bigger risk than the pure passage of time.
What are the real warning signs a product has gone bad?
Clumping, separation, crumbling, an off smell, or a product that feels different on skin.
The Bottom Line
There’s no FDA rule telling you when your mascara expires, and the neat numbers repeated across the industry are conventions built on modest research, not mandates. That doesn’t mean they’re worthless; the mechanisms behind them are real, and the documented infection case, together with the contamination studies, show the risk, while rare, is genuine.
The more useful shift is to stop treating a date as the whole answer. Contamination research points toward handling habits as a stronger predictor of risk than the calendar. Check texture, smell, and how a product behaves on your skin, keep eye products clean, and treat the conventional timelines as a helpful default rather than a hard safety line.
