You pull a bottle of beard oil out of the cupboard that has been sitting there for a while. Still smells fine, you think. But is it actually still good? Beard oil has no date on it like a carton of milk, and that makes it tricky. Here is how long beard oil lasts, where to keep it and how to tell for yourself whether it is still good.

How Long Does Beard Oil Last?

The short answer: 12 months after opening. That applies to all five Rithim beard oils, and it is printed on the packaging.

That period is not a guess. Every cosmetic product sold in Europe needs a safety assessment. For our beard oils, the 12 months were set on the basis of stability testing. Within that period, the product and its ingredients stay stable under normal use and normal storage.

Note the words after opening. The 12 months start the moment you first open the bottle. If you keep a few bottles in stock, open the one you have had longest first.

Twelve months is not a line on which the oil suddenly turns, either. How you store it makes a big difference. A bottle in a cool drawer stays at its best for longer than one that sits in the sun every morning.

Can't remember when you opened it? Check your order confirmation or your order history. At least you will know how long it has been in the house.

The Open Jar With 12M: How to Read Shelf Life on Cosmetics

You will come across two kinds of shelf life on cosmetics. They look different and they mean different things.

The first is a plain date, often with a small hourglass in front of it. It appears on products that keep for less than 30 months. Up to that date the product is good, even if you have not opened it yet.

The second is an open jar with a number and an M inside, such as 6M, 12M or 24M. This is the PAO symbol, short for period after opening. The number is how many months a product stays safe and does its job once opened. Under European cosmetics rules, products that keep for more than 30 months carry this symbol instead of a date.

Rithim beard oil carries 12M. So the symbol tells you nothing about the day you bought the bottle, and everything about the day you opened it.

The difference makes sense. As long as a bottle is closed, no fresh air gets in. From the moment you open it, a little oxygen gets in every time. That is what the rest of this story is about.

Why Beard Oil Does Not Go Mouldy but Does Go Rancid

Beard oil contains not a single drop of water. That sounds like a detail, but it is the reason nothing can grow in it. Bacteria and mould need water. No water, no growth, and that is why beard oil needs no preservative. It is also recorded that way in the safety assessments of our beard oils.

What oil does do is oxidise. Plant oils consist largely of fatty acids, and some of them slowly react with oxygen in the air. That reaction creates compounds with a different smell. That is what we call rancid: the oil picks up an odd off-note, the scent itself goes flat and it feels less pleasant on your skin.

How fast that happens differs from oil to oil. That is why every Rithim beard oil contains vitamin E, an antioxidant that slows the process down. All five also contain squalane, a plant-based oil that oxygen barely gets a grip on because it is already chemically saturated: there is no spot left for oxygen to latch onto.

Together they keep the oil stable for a long time. But even a good formula cannot beat a windowsill in full sun. So it helps to know what ages oil.

Light, Heat and Air: What Ages Oil

Three things speed up oxidation. All three are easy to limit.

Light. Visible light in particular sets oxidation in motion. Daylight through a window is enough, direct sun even more so. That is why Rithim beard oil comes in violet biophotonic glass. It looks almost black and holds back most visible light. According to the safety assessment, that protects the oils, the vitamin E and the scent better than clear or brown glass.

Heat. A rule of thumb from research on plant oils: for every 10 °C warmer, oil oxidises roughly twice as fast. At 30 °C it goes about twice as quickly as at 20 °C.

Air. Every time you open the bottle, fresh oxygen gets in. That comes with the territory and is no problem. Just do not leave the cap by the sink while you work oil into your beard. Drop the oil into your palm, put the pipette back, screw the cap shut and only then rub it in.

And then there is water. It does not age oil, but it simply does not belong in there. Keep the pipette away from your wet beard and drop the oil into a dry hand. That keeps your bottle what it is: water-free.

Beard oil does not go off like milk. It goes rancid, and you can smell it.

The Best Place at Home for Your Beard Oil

Where is your bottle right now? Chances are: in the bathroom. Makes sense, that is where you use it. But not every spot in the bathroom is equally good.

The windowsill is the worst choice. Your bottle gets light every day there, and heat on sunny days. The shelf right above the shower or bath gets warm and humid with every shower. And next to the radiator or a heated mirror, the temperature climbs fast.

A cabinet, a drawer or a wash bag out of the sun is the best place. It stays dark there, it does not get warm and your bottle is still within reach. If you prefer to groom in the bedroom, a drawer there works just as well.

Below 25 °C you are fine. Normal room temperature is perfect. It does not need to be cold, as long as it does not get warm and no sun falls on it.

Do you switch between several scents? Then keep an eye on the bottle you reach for less often. The 12 months keep running even if you hardly use it.

On the Go: Car, Gym Bag and Holidays

Once your beard oil leaves the house, it has a harder time than at home.

The car is the biggest risk. A test by the Belgian motoring club VAB found that the inside of a car in full sun can reach around 50 °C. The dashboard gets much hotter still. Using the rule of thumb above, oil at 50 °C oxidises about eight times as fast as at 20 °C. A bottle that spends a summer in the glovebox ages fast. Take it inside with you.

The same goes for holidays. Do not leave your bottle in the beach bag in the sun. Keep it in your wash bag in your room, away from the window.

Flying with hand luggage only? At 30 ml, the bottle is well within the 100 ml limit for liquids that still applies at many airports. During take-off, cabin pressure drops. The air in the bottle expands a little and can push some oil past the cap. Screw it shut firmly and put it in the clear bag, and the rest of your luggage stays clean.

And the gym bag? A few hours in the changing room does no harm. Just do not leave it in a bag in the boot all summer.

Should Beard Oil Go in the Fridge?

No. Cold does slow oxidation, but normal room temperature is more than enough for beard oil.

The fridge even has downsides. Some oils turn thick or cloudy when they get cold. That is harmless, because they turn clear again at room temperature. But cold, syrupy oil is harder to dose.

On top of that, if you keep taking a cold bottle into a warm, steamy bathroom, moisture condenses on the glass. Around the neck too, where you open it. That is exactly what you want to keep out of a water-free product.

A cool, dark cupboard is the best middle ground. Your oil keeps well there, and it is ready to use straight away.

How to Spot Rancid Beard Oil: Smell, Look, Feel

Your nose is the best tool you have. Put a drop in your palm and smell it before you spread it.

Smell. Fresh beard oil simply smells of its scent. Rancid oil smells different: of old frying fat, crayons, paint or nail polish remover. Often you first notice it as an odd off-note. If you smell that, the oil has oxidised.

Look. Check the drop in your palm. If the oil is clearly darker than you are used to, or stays cloudy at room temperature, something has changed. Cloudiness after a cold night does not count, as long as it clears at room temperature.

Feel. Fresh oil feels light and smooth. If it has become thicker or sticky, take that as a sign.

And pay attention to your skin. If your skin suddenly reacts with itching or redness to an oil it used to handle fine, stop using it. Oxidised oil can irritate the skin.

Notice any of these signs? Get a new bottle. You will find all five scents in our beard oil range. Not sure about a bottle that has been open for a while? Send us a message and we will take a look with you.