Swedish Red Cedar Oil: Uses, Repellent Research & FAQ
Swedish red cedar oil is a concentrated, naturally derived cedar oil traditionally used with cedarwood in wardrobes, drawers and clothing storage. Its distinctive woody aroma can be used to refresh suitable cedarwood pieces when their natural scent becomes less noticeable.
Cedarwood oil is also more than a traditional wardrobe product. Its insect-repellent and bioactive properties have been investigated in published scientific research and documented by the US Environmental Protection Agency (EPA). Research has examined cedarwood oil in relation to moths and other insects, although results depend on the cedar species, oil composition, concentration, target pest and conditions of use.
What is Swedish red cedar oil?
Swedish red cedar oil is a concentrated cedar oil used to refresh suitable cedarwood products such as balls, blocks, cubes, rings, discs and hangers.
Our Swedish red cedar oil is 100% cedar oil. A small amount can be applied to unfinished cedarwood to restore a stronger cedar aroma and help extend the useful life of reusable cedarwood products.
Has cedarwood oil been scientifically studied?
Yes. Cedarwood oil has been studied for its repellent and biological activity against certain insects and arthropods.
A scientific profile prepared by the New York State Integrated Pest Management Program at Cornell University describes cedarwood oil as a natural substance used as an insect repellent, often in relation to mosquitoes and moths. The same review summarises published studies on cedarwood oil and fabric pests.
Historic US EPA documentation also identifies cedarwood oil as an active ingredient in pesticide products used to repel moths and fleas. EPA records specifically describe natural cedarwood blocks used to repel moths from clothing and fabrics.
Read the Cornell University cedarwood oil profile
Read the US EPA cedarwood oil fact sheet
Does cedarwood oil repel moths?
Cedarwood and cedarwood oil have a documented history of use in moth-repellent applications for clothing and fabrics.
EPA documentation describes cedarwood oil products used to repel moths, including solid cedarwood blocks intended for use with clothing. Published research reviewed by Cornell has also investigated the effect of Virginia cedarwood oil vapour on larvae of the webbing clothes moth (Tineola bisselliella).
In controlled laboratory conditions, cedarwood oil vapour produced high mortality in clothes moth larvae at tested concentrations. Research reviewed by Cornell also reported susceptibility in certain carpet beetle species.
These studies provide a scientific basis for the traditional use of cedarwood and cedarwood oil in clothing storage. However, laboratory results should not be interpreted as a guarantee that cedar oil alone will prevent or eliminate every moth problem in a home.
How does cedarwood oil work as an insect repellent?
Cedarwood oil naturally contains aromatic compounds including terpenoids such as cedrene and cedrol.
The Cornell cedarwood oil profile, citing EPA documentation, explains that the repellent mode of action is associated with these naturally occurring terpenoid compounds.
EPA has historically described cedarwood oil as repelling insects through a non-toxic mode of action. This refers to how the repellent effect works and should not be interpreted as meaning that concentrated cedar oil requires no care when being handled.
Is cedarwood oil non-toxic?
Cedarwood oil has a comparatively favourable toxicological profile in the scientific and regulatory literature reviewed by Cornell and the EPA.
The Cornell profile describes cedarwood oil as having relatively low mammalian toxicity and notes that product-specific acute toxicity studies did not demonstrate significant acute toxicity. EPA documentation also states that cedarwood oil repels insects through a non-toxic mode of action and concluded that registered uses, when used according to their labels, were not expected to cause unreasonable adverse effects to human health or the environment.
However, cedarwood oil is still a concentrated natural oil and should be handled responsibly. Avoid ingestion and eye contact, avoid unnecessary direct skin contact and always follow the instructions supplied with the individual product.
Is natural cedar oil automatically safe?
No concentrated essential oil should be considered completely harmless simply because it comes from a natural source.
Scientific assessments of cedarwood oil are generally reassuring for normal intended uses, but concentrated oils can still cause irritation if handled incorrectly or used in excessive amounts.
For wardrobe care, use a small amount, apply it to suitable cedarwood rather than directly onto clothing, and allow freshly treated wood to dry before returning it near textiles.
What is Swedish red cedar oil used for?
For everyday wardrobe and storage care, Swedish red cedar oil is particularly useful for refreshing suitable cedarwood products and restoring their characteristic aroma.
- Refresh cedarwood balls, blocks and cubes
- Refresh cedar rings and discs
- Refresh hanging cedar pieces
- Refresh suitable unfinished cedarwood hangers
- Maintain reusable cedarwood products over time
- Bring the characteristic cedar aroma back to wardrobes and drawers
For a broader guide to choosing and using cedarwood formats, visit our Swedish Red Cedar Wood & Oil Guide.
How do I use Swedish red cedar oil?
Use a small amount. Cedar oil is concentrated, so heavy application is unnecessary.
- Remove the cedarwood item from the wardrobe, drawer or storage space.
- Place it on a protected, non-porous surface.
- Apply a small amount of cedar oil to the unfinished wood.
- Allow the oil to absorb.
- Leave the wood to dry fully before returning it near clothing or textiles.
Always follow the directions supplied with the individual cedar oil product.
Can I apply cedar oil directly to clothes?
We recommend applying cedar oil to suitable cedarwood rather than directly onto clothing.
Concentrated oil can mark absorbent materials, particularly pale, delicate or valuable fabrics. Allow freshly treated cedarwood to dry completely before returning it to a wardrobe, drawer or storage box.
How do I refresh cedarwood with cedar oil?
When cedarwood becomes less aromatic, it usually does not need to be replaced immediately.
Apply a small amount of Swedish red cedar oil to suitable unfinished cedarwood and allow it to absorb fully. Once dry, return the refreshed cedarwood to its normal storage location.
Suitable unfinished cedarwood can also be lightly sanded before oil is applied. Remove all sanding dust and make sure the surface is smooth before placing it near clothing.
How often should I reapply cedar oil?
There is no single schedule that suits every wardrobe or storage space.
Airflow, temperature, the amount of cedarwood and the size of the storage area can all affect how quickly the aroma becomes less noticeable. Refresh the cedarwood when needed rather than applying large amounts on a fixed schedule.
Where can Swedish red cedar oil be used?
Swedish red cedar oil is commonly used to refresh suitable cedarwood placed in areas such as:
- Wardrobes
- Drawers
- Clothing storage boxes
- Linen cupboards
- Shelves
- Other suitable enclosed storage spaces
Apply the oil to suitable cedarwood rather than directly onto fabrics, painted surfaces or absorbent materials unless the specific product instructions state otherwise.
Can cedarwood oil help with other insects?
Scientific research has examined cedarwood oil against several insects and arthropods in addition to clothes moths.
The Cornell review includes studies involving carpet beetles, termites, mosquitoes and other organisms. Different studies have reported repellent, insecticidal or other biological effects under particular laboratory or experimental conditions.
This does not mean that one cedar oil product should be assumed to control every insect. Results vary considerably depending on the target species, concentration, exposure time, cedar species and formulation.
Can cedar oil get rid of an established moth infestation?
Cedarwood oil and cedarwood should not be treated as a complete solution for an established clothes moth infestation.
If you are seeing repeated adult moth activity, larvae, webbing or fabric damage, inspect the affected textiles and surrounding storage areas carefully. Cleaning, isolation of affected items, monitoring and additional pest-management measures may also be required.
Cedarwood is best used as part of a regular wardrobe and textile-care routine rather than as a guaranteed treatment for an existing infestation.
What is the difference between cedar oil and cedarwood?
Solid cedarwood provides a reusable physical format that can be distributed throughout wardrobes, drawers and clothing storage spaces.
Cedar oil is concentrated and is particularly useful for refreshing suitable cedarwood once its characteristic aroma becomes weaker.
The two formats therefore complement each other: cedarwood provides the reusable storage product, while cedar oil allows suitable pieces to be refreshed over time.
Can cedarwood be refreshed without oil?
Yes. Suitable unfinished cedarwood can often be refreshed by lightly sanding the surface to expose a fresh layer of aromatic wood.
Remove all sanding dust afterwards and make sure the surface is smooth before returning the cedarwood near clothing or textiles.
Which cedarwood products can be refreshed with cedar oil?
Depending on the individual product, Swedish red cedar oil can be used to refresh suitable unfinished cedarwood including:
- Cedarwood balls
- Cedar blocks and cubes
- Cedar discs
- Cedar rings
- Hanging cedar pieces
- Suitable cedarwood hangers
What does the scientific evidence actually show?
The scientific evidence supports a more precise conclusion than either dismissing cedarwood oil as a traditional remedy or presenting it as a universal pest treatment.
Cedarwood oil has documented repellent and bioactive activity against certain insects and arthropods under specific conditions. EPA documentation recognises historic moth-repellent uses, and published research has investigated effects on clothes moth larvae and other fabric pests.
At the same time, performance depends on the oil composition, cedar species, concentration, target species, exposure period and method of use. Evidence involving one insect or laboratory condition should not automatically be extended to every household pest.
This is why we distinguish between published research on cedarwood oil and the specific claims supported for an individual product.
Swedish red cedar oil: key points
- Cedarwood oil has documented insect-repellent and bioactive properties under specific conditions.
- EPA documentation records cedarwood oil and natural cedarwood in moth-repellent applications for clothing.
- Scientific studies have investigated cedarwood oil against clothes moth larvae and other insects.
- EPA has described its insect-repellent action as a non-toxic mode of action.
- Cornell's scientific profile describes relatively low mammalian toxicity.
- Performance varies by oil composition, concentration, target species and conditions of use.
- Swedish red cedar oil is particularly useful for refreshing reusable cedarwood products.
- Use concentrated cedar oil carefully and according to the individual product instructions.
Scientific sources
The research and regulatory information discussed on this page includes the following sources:
- Cedarwood Oil Profile – New York State Integrated Pest Management Program, Cornell University
- Wood Oils and Gums (Cedarwood Oil) R.E.D. Facts – US Environmental Protection Agency
For practical guidance on cedar balls, blocks, rings, hangers and cedar oil in wardrobes and storage spaces, visit our Swedish Red Cedar Wood & Oil Guide.