How to Store Valerian Oil So the Aroma Lasts

Valerian oil is not a delicate flower oil that vanishes if you look at it wrong, but its big, earthy character is exactly what you bought it for, and a little care keeps it that way. The good news is that the rules are short and cheap: keep it cool, dark, capped and nearly full. Here is the reasoning behind each one.

Valerian Root Essential Oil

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What actually wears an oil out

The Tisserand Institute names three things that encourage oxidation: heat, light and moisture. It adds that the more air there is in a bottle, the faster the oil oxidizes, and that refrigeration will about double an oil's useful lifespan. Oxidation shows up first in the nose, since it alters the perceptible odor and sometimes the viscosity.

Our own storage line is the practical version of the same idea. We say the unopened oil typically keeps for 3 to 5 years, stored tightly capped in a dark, cool cabinet and away from pets. The Certificate of Analysis for the one batch we publish carries a best-by date of 04/30/2028. Treat those as guides and your own bottle's date as the one that counts.

Where valerian fits

Valerian root oil is a mix of heavier compounds and some lighter, more volatile ones. In a laboratory study of five Estonian root samples, alpha-pinene ranged from 0.4% to 3.6% and camphene from 0.6% to 5.9%, alongside bornyl acetate and valerenal. Light, volatile molecules are the ones that tend to fade first when a bottle sits in sun or warmth, so our reasoning is that a hot windowsill takes the lift off the top of the scent. We have not seen a stability study of valerian oil itself, so that is a reasoned guess and not a measured result.

From the day it arrives

Date it. Write the opening date on the bottle. A bottle opened last month and one opened five years ago look identical from the outside.
Keep it cool and dark. A closed cabinet in a room that stays steady beats a shelf over a radiator, a sunny sill or a car. Our bottles are amber glass with a black cap, which helps with light, and the cabinet does the rest.
Cap it and wipe the neck. A thick oil leaves residue on the thread. A quick wipe keeps the seal tight and the cap easy to turn.
Keep water out. Pour or measure into a separate clean container rather than dipping a pipette back into the stock. Moisture is the third accelerant on Tisserand's list.
Keep it out of reach. Keep the bottle away from children and pets. Cats are strongly drawn to this scent, so a sealed bottle high in a closed cabinet is the sensible place. In a study of six domestic cats, valerian was one of five plants that could draw a response, and individual cats differed in how strongly.

Small bottles, large bottles

Air in the bottle is the lever you can pull. Each time you open a half-empty bottle you swap its vapour for fresh air, and a big empty space holds a lot of oxygen. If you buy one of our larger sizes and use it slowly, decanting working amounts into smaller airtight bottles keeps the stock sealed and the small bottles close to full. It follows from the headspace point above. For first-time buyers, we suggest the smallest size, partly for this reason and partly because the scent divides people. Our guide to valerian oil sizes goes through the options.

When you decant into a small bottle, label it with the name, the date and the strength if it is diluted, using a marker that will not smear. Three similar brown bottles look identical in a cabinet, and future you will not remember which one holds the root oil.

Setting up a spot for it

Pick the bottle's home on the day it arrives, before it ends up wherever there was room. A small lidded box on a high shelf in a closed cupboard works well: it keeps light off the glass, keeps the bottle upright and gives you somewhere to keep a pen and a few labels. Because the scent is so tenacious, a closed box may also keep it from drifting through the rest of the cupboard, which your towels will appreciate.

What about the refrigerator?

Refrigeration is optional for an oil you use a few drops at a time. If your cabinet stays cool all year, the fridge adds little. If you do use it, there are two things to keep in mind. A thick oil gets thicker when cold, so it pours more slowly. And a cold bottle opened in a warm room collects condensation, so let it come to room temperature before you take the cap off. Keep it in a labelled, sealed box away from food and out of reach of children.

How to tell when it has had its day

Tisserand lists the signs: the scent changes and loses freshness, and old oils can thicken or even solidify. For valerian, where the aroma is the whole point, your nose is the test. Compare it with a fresh bottle if you have one, or with your memory of the first opening. If it has turned sharp, flat or sour, do not use it on skin, and ask your local waste authority how to dispose of it.

Finished blends age faster than the neat oil, because the carrier has its own best-by date. Our notes on diluting valerian oil cover making a small stock, and how valerian oil is made explains why one lot can smell different from the next.

In short: cool, dark, capped, dated and nearly full. Do that, and the bottle should smell like itself for a long time.