Lavender oil for anxiety and sleep: capsules, aromatherapy and safety

Lavender comes in several forms that behave differently. Essential oil is inhaled, diffused in a room or diluted for massage. Capsules contain a specially prepared oil taken by mouth. Dried flowers appear in teas and sleep pillows. The strongest recent research concerns capsule preparations, so results do not necessarily describe a room spray.

The NCCIH says research suggests oral lavender oil might help anxiety, including anxiety that co-occurs with symptoms of depression. It also points to limitations such as small sample sizes and a lack of independent funding. A cautious reading is that it is plausible and worth further study, not that it is proven.

Persistent worry that interferes with daily life deserves a proper assessment. GPs can arrange talking therapies, which can be self-referred in many parts of England, and discuss medicines where suitable. The linked wellness guides outline first steps, and none of them are replaced by a capsule.

Many people use lavender oil or pillow sprays at bedtime. Evidence for sleep quality and insomnia is unclear. The NHS notes that some over-the-counter sleep remedies contain natural ingredients such as valerian or lavender, but says these provide only short-term relief, and it points to changing sleep habits and, where needed, cognitive behavioural therapy.

• Keep a regular wake time, even after a poor night.

• Keep the bedroom dark, quiet and cool, and avoid screens before bed.

• See your GP if poor sleep has lasted months or is affecting daily life.

Preliminary findings suggest lavender may help sexual dysfunction linked to menopause and might reduce cough severity in people with COVID-19, but more reliable studies are required before drawing conclusions. Aromatherapy benefits are generally inconclusive, though many people simply find the scent relaxing, which is a reasonable personal reason to use it.

Short-term oral use appears safe at the amounts studied. Some people experience diarrhoea, headache, nausea or burping, and lavender-flavoured aftertaste is common. Oral products should come from a reputable source with a defined strength, since essential oil sold for diffusing is not intended for swallowing and should never be taken by mouth.

Topical lavender products may cause allergic skin reactions. A few cases of breast tissue swelling in children using lavender products on the skin have been reported, although whether lavender was the cause is not clear. For that reason, parents should be cautious with lavender oils in baby wash, massage oil and bedtime balms, and speak to a pharmacist or health visitor first.

Patch-test any diluted oil on a small area, avoid the eyes, and stop if redness, itching or swelling develops.

There are theoretical concerns that lavender could interact with sedative drugs or herbs, which is particularly relevant before an operation, so tell the anaesthetist about any supplement. Little is known about safety in pregnancy and breastfeeding, and the NHS does not recommend herbal medicines for either.

In the UK, lavender capsules may be licensed or registered products, and others are food supplements. A registration mark reflects safety, quality and information, but the MHRA does not assess effectiveness. Essential oils are generally sold as cosmetics or fragrances, and the MHRA has noted that quality varies across unlicensed products.