Essential oils are concentrated aromatic extracts from plants. They can make a room smell wonderful and be a pleasant part of a relaxing routine. They are also potent chemicals, so a little knowledge goes a long way.
What essential oils are
An essential oil is the volatile, aromatic part of a plant, captured from flowers, leaves, bark, peel, resin or roots. “Essential” refers to the plant's essence or scent, not to being essential for health. Each oil is a mix of many natural compounds, which is why lavender, peppermint and lemon smell so different, and why each oil has its own safety profile.
Because it can take a large amount of plant material to produce a small bottle, essential oils are far more concentrated than the herb itself. A drop of peppermint oil is not the same as a mint leaf in your tea.
How they're made
- Steam distillation is the most common method. Steam passes through plant material, carrying aromatic compounds that are then condensed and separated from the water.
- Cold pressing (expression) is used mainly for citrus peels such as lemon, orange and bergamot.
- Solvent extraction produces “absolutes” from delicate flowers like jasmine. These are technically not essential oils, though they're often sold alongside them.
Extraction method matters: a cold-pressed citrus oil can contain compounds that make skin more sensitive to sunlight, while a distilled version of the same fruit usually does not. Our safety guide explains why.
Common ways to use them
Inhalation
The simplest approach is to smell the oil: a drop on a tissue or cotton pad, a personal inhaler, or a diffuser that disperses oil into the air. Inhalation is how most people enjoy aromatherapy day to day. Keep sessions short and rooms ventilated. See our diffuser guide for details.
Diluted on the skin
For massage or a scented body oil, essential oils should be diluted in a carrier such as jojoba, sweet almond or fractionated coconut oil. Undiluted (“neat”) oils can irritate skin or trigger allergic reactions, sometimes after weeks of apparently trouble-free use. Always patch test first.
Around the home
Many people add oils to homemade room sprays or cleaning routines for scent. Keep bottles capped, labelled and stored out of reach of children and pets.
What we don't recommend
Don't swallow essential oils or add them to drinking water unless a qualified professional has specifically advised it. Essential oils are a common cause of calls to poison centers, and swallowing even small amounts can be dangerous, especially for children.
What the research says, honestly
Aromatherapy is popular, but good-quality research on it is limited. According to the US National Center for Complementary and Integrative Health, it's not known whether aromatherapy helps with insomnia because little rigorous research has been done, and some studies show effects on mood without measurable effects on stress markers or pain.
A calming scent ritual can still be worthwhile, but be wary of anyone claiming an oil can cure, treat or prevent a disease. In the US, products marketed with such claims are regulated as drugs, as the FDA explains. If you have a health condition, see a healthcare professional rather than self-treating.
A simple starter approach
- Start with one or two familiar, widely used oils, such as lavender or sweet orange, rather than a large kit.
- Learn each oil's cautions before using it. Read the label and our safety guide.
- Begin with inhalation: a drop on a tissue or a short diffuser session.
- If you use oils on skin, dilute and patch test first.
- Notice how you feel. Scent preference is personal; if a smell gives you a headache or feels overwhelming, stop.
- Store safely: tightly capped, away from heat and light, and out of reach.
Who should take extra care
Check with a healthcare professional before using essential oils if you are pregnant or breastfeeding, have asthma or another respiratory condition, epilepsy, sensitive skin or allergies, or take regular medication. Be especially cautious around babies, young children, older adults and pets.
Quick answers
Are natural oils automatically safe?
No. Many plant compounds can irritate skin, cause allergies or be toxic if swallowed. “Natural” describes origin, not safety.
How long does a bottle last?
It depends on the oil and storage. Citrus oils tend to degrade faster than many others; keep bottles closed, cool and dark, and discard oils that smell off or have been open for a long time.
Can I use essential oils instead of medicine?
No. Don't replace prescribed treatment with essential oils, and talk to your clinician about anything you're considering.