Skincare does expire, but in the U.S. the date on the box is often not the one that matters. The FDA states that U.S. law does not require cosmetics to carry specific shelf lives or expiration dates. Manufacturers are responsible for making sure products are safe. So the real answer depends on three things: the product type, how long it has been open, and how it was stored.
This guide covers how to read printed dates and the PAO symbol, typical lifespans by product, signs that a product has turned, and storage habits that extend shelf life.
TL;DR
- No U.S. law requires an expiration date on skincare. A printed date is the brand's choice.
- The open-jar PAO symbol shows months of use after opening, for example 12M. The clock starts when the seal is broken.
- With no PAO, a general rule is about one year after opening for most serums and moisturizers, and 6 to 12 months for eye-area products.
- Change in color, texture or smell means stop using the product, whatever the date says.
- Cool, dark storage, clean hands and pump or tube packaging all extend life.
Table of Contents
- What an expiration date means on skincare
- How long skincare lasts by product type
- How long serums last
- How long moisturizers, cleansers and masks last
- How to tell skincare has expired
- Why products go bad: contamination routes
- Storage habits that extend shelf life
- Our perspective: shorter lists, shorter guesswork
- Shop skincare in sizes built for daily use
- Is expired skincare ever fine to use?
- Build a simple expiration routine
- FAQ
- Sources
What an expiration date means on skincare
The FDA defines shelf life as the period a cosmetic is expected to look and work as intended and remain safe. It varies with product type, use and storage. That definition explains why two bottles with the same printed date can age very differently. One sat in a cool drawer. The other lived on a sunny bathroom shelf.
Two kinds of dates appear on packaging.
| Marking | What it means | Where it starts |
|---|---|---|
| Printed date (EXP, "use by", "best before") | Brand's estimate for an unopened product | Date of manufacture |
| Open-jar PAO symbol with a number and M | Months the product stays good once opened | First opening |
| Batch or lot code | Identifies the production run; not always a date | Manufacture |
A printed date assumes the product is sealed and stored properly. Once the seal is broken, air, fingers and temperature swings begin to work on the formula. This is why the PAO number is usually the more useful one for daily use.
How to read the PAO symbol
The PAO symbol looks like an open jar. Inside it sits a number followed by the letter M. 6M means six months, 12M means twelve, 24M means twenty-four. Count from the day the product is first opened, not from the day it was bought.
A practical habit: write the opening month on the bottom of the product with a marker, or on a small label. A product bought in January and opened in June has a June clock.
What a date like "11 2026" means
A month and year printed alone, such as 11 2026, is normally the last month the brand expects the unopened product to be at its best. It does not mean the product turns bad on the first of that month. It also does not apply if the product has been open for a long time, or stored in heat. When both a printed date and a PAO are present, the earlier of the two wins.
How long skincare lasts by product type
There is no single authoritative table. Expert ranges vary by formula, packaging and preservation. NBC Select's interviewed experts give a general one-year rule after opening when no PAO is available, with eye-area products considered for replacement after roughly six months to one year. The table below uses that rule as the base and flags where products usually run shorter.
| Product | Typical window after opening | What shortens it |
|---|---|---|
| Cleanser | Around 12 months | Water in the bottle, wet hands in a jar |
| Toner or essence | Around 12 months | Water-based formula, open-neck bottles |
| Serum | Around 12 months as a general rule | Light, heat, unstable actives such as vitamin C |
| Moisturizer | Around 12 months | Jar packaging, dipping fingers |
| Eye cream or eye serum | 6 to 12 months | Close contact with a sensitive area |
| Face oil | Around 12 months, check the label | Heat, light, air exposure |
| Face mask | Follow the label; wash-off masks in tubes about 12 months | Jars, shared use |
| Sunscreen | Follow the label and the printed date | Heat in cars and beach bags |
Treat every row as a starting point. The label and the product itself overrule it.
How long serums last
Serums draw the most questions because they are concentrated, thin and often packed with actives. The same NBC Select experts give a general one-year rule for serums after opening when there is no PAO. They also point out that water-based formulas carry more microbial risk, and that pumps reduce exposure to bacteria and oxygen compared with open droppers.
Two things push that figure up or down.
Formula. Water-based serums need a working preservative system. Oil-based and waterless formats leave less room for microbes to grow. Our piece on waterless skincare and potency covers how that format differs.
Active ingredients. Vitamin C is the best-known unstable active. Wirecutter reports that vitamin C serum stability depends strongly on formulation and storage. Lower temperatures, protection from light and air, and a cool, dark location can extend quality. Its dermatology sources say some serums may visibly change after three or six months, so a 12-month rule without a readable PAO is a general rule only, not a guarantee.
A vitamin C serum that has darkened is worth replacing. According to the same Wirecutter report, degraded vitamin C may become less effective or ineffective, and may irritate skin or worsen the condition being treated.
Dropper, pump or airless: why packaging matters
Every time a dropper goes back into a bottle, it carries skin contact and air with it. Pumps and airless containers limit both. When choosing between sizes, a smaller bottle used up in four to six months beats a large one stretched past a year.
How long moisturizers, cleansers and masks last
Moisturizers are emulsions, a blend of water and oil held together. The FDA notes that emulsions can separate, and that products can dry out, harden and crack. A cream that has split into a watery layer and an oily layer has lost the structure the formula was built on.
Jars deserve a note. Fingers bring bacteria into the product with every scoop. A clean spatula or a pump or tube format reduces that exposure. Cleansers and masks follow the same logic: keep water out of the container, close the lid, and do not decant into unlabeled containers.
How to tell skincare has expired
Use the senses before the calendar. The FDA says exposure to sunlight, air or temperature changes can alter color, texture or smell. Check these:
- Smell. A sharp, sour, rancid or paint-like odor where there was none before.
- Color. Yellowing, browning or darkening. Vitamin C serums often go from pale to amber or brown.
- Texture. Separation, graininess, clumps, a thin watery layer, or a cream that has dried and cracked.
- Visible growth. Specks, film or fuzz. Discard immediately.
- Skin reaction. New stinging, redness or breakouts from a product that was fine before.
The FDA also states that preservatives can break down over time, permitting bacteria and fungi, including mold and yeast, to grow. Growth is not always visible. A product can look normal and still be contaminated, which is why the one-year rule exists as a backstop.
What happens if you use expired skincare
Two separate problems exist.
- Lower performance. Actives lose strength, so the product does less than promised.
- Irritation or infection risk. Broken-down preservatives allow microbes to grow. Use near the eyes, on broken skin or on active acne carries the most risk.
People with reactive skin, a recent procedure, or any history of eye infections should be stricter about replacement. A dermatologist or an eye doctor is the right person to see if redness, swelling, pain or discharge follow use of an old product.
Why products go bad: contamination routes
The FDA's microbiological safety guidance lists the routes: contaminated ingredients, inadequate preservation, failed protective packaging, poor shipping or storage, and consumer use. The first three sit with the manufacturer. The last two sit with the person using the product.
The FDA recommends:
- Follow the manufacturer's storage directions.
- Keep containers clean.
- Wash hands before use.
- Never add water or saliva to a cosmetic.
The last point catches people who thin a dried-out serum or mascara-style product with water. That introduces microbes and dilutes the preservative.
Storage habits that extend shelf life
Heat, light and air are the three accelerants.
- Keep products out of the bathroom shower zone when possible. Steam and heat cycles speed up change. A bedroom drawer or closet shelf is cooler and more stable.
- Store away from windows. Sunlight alters color, texture and smell.
- Close lids fully after each use.
- Use clean hands or a clean spatula.
- Refrigerate selectively. Wirecutter notes lower temperatures help vitamin C serums. Check the label first, since some creams and oils can thicken or separate when cold.
- Do not leave products in a hot car, gym bag or suitcase.
- Buy sizes you can finish inside the PAO window.
Our perspective: shorter lists, shorter guesswork
We formulate with fewer ingredients on purpose. A short, transparent ingredient list is easier to read, easier to check against a label, and easier to judge by sight and smell. Fewer components also means fewer things that can degrade at different speeds.
We also see expiration questions as a storage question first. Most complaints about a product that "went off" trace back to a warm shelf, a wet jar or a bottle used for two years. A routine built from a few well-chosen products, used up in sequence, keeps everything inside its window. Barrier-focused and sensitive-skin routines benefit most, since reactive skin is the first to show a problem with an old product.
Our advice is simple. Date the bottle when opened. Store it cool and dark. Trust smell, color and texture over the calendar. Replace when in doubt. Skin is cheaper to protect than to repair.
— Kelly
Shop skincare in sizes built for daily use
Yuka+Face makes vegan, cruelty-free, natural skincare for all skin types and ages: cleansers, toners, serums, oils, moisturizers and masks. Browse the full range in the Yuka+Face shop, or start with a single step such as the Vitamin C Glow Serum. Always check the label on the product you receive for its PAO and storage directions.
For a gift, the shop also lists a gift card from $50.
Is expired skincare ever fine to use?
The honest answer is: sometimes it is merely weaker, and sometimes it is a problem. A moisturizer a few weeks past its date, stored well, with normal smell and texture, is a low-risk case. A serum eight months past a 6M PAO, eye-area product or anything that smells off is not worth testing.
A useful sorting rule:
- Replace at once: anything used near the eyes, any product with visible growth, any product that has changed smell, color or texture, anything that causes a reaction.
- Judge by condition: sealed, well-stored products slightly past the printed date.
- Do not use: products several years old, such as a decade-old lotion. Its preservatives have had years to break down and its ingredients have changed.
Build a simple expiration routine
- When a product is opened, write the month on the bottom.
- Look for the PAO symbol and note the number.
- If there is no PAO, count 12 months for most items and 6 to 12 for eye-area products.
- Once a quarter, sniff and look at every product in the routine.
- Replace vitamin C, retinoid and other active serums sooner if they darken.
- Keep a short list of products so each gets finished.
Fewer products used consistently also tend to expire less often than a drawer of half-used ones. Our guides to vegan skincare and the morning skin care routine show how to build a compact set.
FAQ
How long is skincare good for after the expiration date?
There is no safe universal number. A sealed product stored cool and dark may stay fine for a short time after its printed date, while an opened product can turn sooner. Check smell, color and texture, and replace anything that has changed. Eye-area products and vitamin C serums should not be stretched.
How do I check if my skincare is expired?
Look for a printed date and the open-jar PAO symbol, then count from the day you opened the product. Smell it, check the color, and look for separation or graininess. If there is no date and you cannot remember when you opened it, a general rule is about one year.
What does the PAO symbol mean?
The open-jar symbol with a number and the letter M shows how many months a product stays good after first opening. A 12M mark means twelve months. The clock starts when you break the seal, not when you buy it.
How long do serums last?
Experts give a general one-year rule after opening when there is no PAO. Unstable actives such as vitamin C can change within three to six months, especially in heat and light. Pumps and cool, dark storage help.
Can you use 10-year-old lotion?
No. Preservatives break down over time, which permits bacteria and mold to grow, and the formula itself changes. Replace it rather than test it on your skin.
Sources
- Shelf Life and Expiration Dating of Cosmetics, FDA
- Microbiological Safety and Cosmetics, FDA
- Do Beauty Products Expire? Experts Weigh In, NBC Select
- You Might Be Storing Your Vitamin C Serum Wrong, Wirecutter