Lavender
In short
Summary of findings for quick reference
Lavender (Lavandula angustifolia) has a long European tradition for restlessness, mild stress, and difficulty sleeping. Two regulators anchor that tradition today. The German Commission E and the EMA HMPCEuropean Medicines Agency, Committee on Herbal Medicinal Products (HMPC) both list lavender flower (Lavandulae flos) and lavender oil (Lavandulae aetheroleum) for traditional use covering restlessness, mild mental stress, and sleep. The flower and the essential oil are separate plant-part scopes with separate monographs.
Modern clinical research has concentrated on one specific preparation, the standardised oral lavender oil capsule (Silexan), studied in generalised anxiety disorder. That work is the research on a registered prescription medicinal product and sits on the clinical axis. It does not transfer to traditional tea, an aromatic bath, a scented pillow, or diluted topical oil, so this entry cites the research without framing lavender as a treatment for anxiety.
On the historical axis the significance is established rather than foundational, and the reason is honest species discipline. The deep classical record (Dioscorides, Pliny) describes Lavandula stoechas, a sister species, not true lavender. The continuous documentary record for L. angustifolia runs from the medieval and Renaissance physic-garden tradition to the modern monographs. The practical takeaway: a calming, well tolerated household herb with a real European tradition and two regulator monographs, best used as flower tea, a scented sachet, an aromatic bath, or correctly diluted topical oil.
Clinical evidence ↔ Historical significanceWe display two separate evidence categories: clinical evidence from modern trials and historical significance from documented healing tradition. Both are valuable, but they answer different questions.Read more
In every encyclopedia entry we evaluate two distinct categories of evidence. Clinical evidence as used in trials meets a narrower but scientifically essential bar. At the same time, the hundreds of thousands of plant species worldwide have only partially been captured and tested in modern studies.
Alongside the trial picture our researchers compile a comprehensive overview of where and since when a plant has been used across different traditions of natural medicine. When a plant has been used as a medicinal plant in many cultures across many generations, that historical significance deserves to be visible too.
Our position: a truly informative overview emerges only when both categories sit side by side. We communicate transparently what counts as what.
Overview
Lavender (Lavandula angustifolia), also called true lavender or English lavender, is an aromatic woody perennial of the Lamiaceae (mint) family. Native to the Mediterranean basin and cultivated across Provence, Italy, and parts of Austria and Hungary, the dried flower spikes and the steam-distilled essential oil have a long European tradition for restlessness, mild stress, and difficulty sleeping.
Two regulatory bodies anchor its modern profile. The European Medicines Agency Committee on Herbal Medicinal Products (EMA HMPCEuropean Medicines Agency, Committee on Herbal Medicinal Products (HMPC)) lists lavender flower and lavender oil for the traditional relief of mild symptoms of mental stress and as an aid to sleep. The German Commission E published a positive monograph for restlessness, sleep disturbances, and dyspeptic complaints. The most studied bioactives are linalool (around thirty to forty percent of the essential oil) and linalyl acetate (around thirty percent).
History
Lavender has been a Mediterranean cultural staple for over two thousand years. The Romans added the flowers to their bathwater, and the Latin verb lavare (to wash) is the root of the English and German names alike. Through the medieval period, lavender was a fixture of monastic physic gardens across Europe, where it was grown for its scent, its calming infusions, and its use in linen cupboards against moths.
In Austria and southern Germany the plant has held a place in the Hausmittel tradition for restful sleep and a calming bath. The European Medicines Agency Committee on Herbal Medicinal Products (EMA HMPCEuropean Medicines Agency, Committee on Herbal Medicinal Products (HMPC)) and the German Commission E both list lavender flower preparations in their monographs covering traditional use. Beyond traditional preparations, a standardised lavender oil capsule sold under the brand name Silexan (WS1265) is registered in Germany and Austria as a prescription medicinal product for anxiety; it is a separate regulatory category and not a CNP food-supplement.
Mechanism
The essential oil of Lavandula angustifolia is dominated by two terpene compounds: linalool (around thirty to forty percent) and linalyl acetate (around thirty percent). Laboratory studies have examined linalool and its acetate for activity at voltage-gated calcium channels and at several serotonin receptor subtypes, with the most-cited line of receptor work focusing on 5-HT1A binding affinity for linalool.
Two routes carry the proposed mechanisms. The aromatic route (inhalation through pillow filling, aromatic bath, or essential-oil diffusion) involves olfactory signalling and direct absorption of volatile compounds through the nasal mucosa. The ingested route (an oral standardised oil capsule such as Silexan) involves systemic absorption through the gut. The two routes produce different blood-level profiles and the research on one route does not transfer cleanly to the other. How either route translates from laboratory receptor work into a felt effect on stress or sleep is not fully resolved.
Modern clinical research on lavender has focused on the oral, standardised essential-oil capsule rather than the traditional tea or aromatic preparations. Kasper and colleagues published a 2014 randomised controlled trial of Silexan (a standardised oral lavender oil preparation, eighty milligrams per day) versus placebo in adults with generalised anxiety disorder, reporting improvements in standard anxiety rating scales. Woelk and Schläfke published a 2010 trial of the same preparation versus lorazepam in adults with generalised anxiety disorder, reporting comparable improvements over six weeks.
Across this body of work the picture is one of an oral standardised oil preparation with meaningful research support in the specific clinical context of generalised anxiety disorder. Aromatherapy claims (sleep, calm, mood) are popular but less consistently studied; the aromatic literature is smaller in scale and more heterogeneous. The Silexan research is the research on a registered medicinal product and is not directly transferable to traditional tea, pillow filling, or diluted topical oil use. CNP cites the research without framing lavender as a treatment for anxiety.
Usage
Forms and preparation
For tea, place one to two teaspoons of dried lavender flowers (roughly one to two grams) in a cup and pour freshly boiled water over them. Cover the cup for five to ten minutes to keep the aromatic oils in the brew, then strain. Topical essential oil is always diluted in a carrier oil; a one to three percent dilution (around three to nine drops of essential oil per tablespoon of carrier) is the safe range for adult skin. Dried lavender flowers also fill aromatic pillows and sachets for a calming bedroom or linen cupboard. A handful in a warm bath gives a fragrant aromatic infusion. Never apply undiluted essential oil to the skin and never swallow essential oil. The standardised oral capsule preparation (Silexan, eighty milligrams) is a separate medicinal product available by prescription in Germany and Austria and is not a CNP food-supplement.
Dosage
As a tea, one to three cups per day is the traditional range, often in the evening or after a meal. For topical use, dilute essential oil in a carrier oil at one to three percent; reapply two to three times per day on intact skin. For aromatic use, a few drops in a diffuser or a handful of dried flowers in a bath cover the typical traditional applications. Never swallow neat essential oil. The clinical research on oral lavender oil uses a specific standardised preparation (Silexan, eighty milligrams per day), which is a registered medicinal product in Germany and Austria, not a self-administered preparation. If you are interested in the oral capsule, ask your doctor or pharmacist.
Safety
Look-alikes
Toxic look-alikes
Lavandin (Lavandula x intermedia)
Lavandin is a hybrid of Lavandula angustifolia and L. latifolia. It grows larger and yields more essential oil but has a much higher camphor content; it is considered less suitable for aromatherapy than true lavender. The EMA HMPC monograph and the Silexan research use Lavandula angustifolia exclusively.
FAQs
What is the difference between Lavandula angustifolia and Lavandin?
Lavandula angustifolia (true lavender or English lavender) is the species used in the EMA HMPC monograph, in Commission E, and in the Silexan clinical research. Lavandin (Lavandula x intermedia) is a hybrid of L. angustifolia and L. latifolia, with higher essential-oil yield but also a much higher camphor content. Lavandin is widely used in cosmetics and cleaning products but is considered less suitable for aromatherapy and not interchangeable with true lavender in the traditional or research context.
What is Silexan?
Silexan (WS1265) is a standardised oral lavender oil preparation in capsule form, registered in Germany and Austria as a prescription medicinal product for anxiety. The clinical research on oral lavender oil (Kasper 2014, Woelk and Schläfke 2010) was conducted on this specific preparation at eighty milligrams per day. Silexan is a medicinal product, not a CNP food-supplement, and is not the same as a self-prepared lavender oil. Talk to your doctor or pharmacist if you are interested in it.
Can I swallow lavender essential oil?
No. Neat essential oil is never taken by mouth as a self-prepared remedy. It is highly concentrated and can irritate the mouth, throat, and stomach lining. The clinical research on oral lavender oil used a specific standardised preparation in capsule form (Silexan), which is a registered medicinal product available by prescription. If you are interested in an oral lavender oil capsule, ask your doctor or pharmacist.
What time of day is best for lavender?
Traditional use sits in the evening: a cup of tea an hour before bed, a few drops of essential oil in a diffuser, or a lavender pillow on the bedside table. There is no fixed rule, but the calming aromatic profile is more often used at the end of the day than at the start of it. Read it as part of an evening wind-down rather than as a sleeping aid.
Legal notice: The depiction of historical significance and traditional use is context within our encyclopedia and not a health claim for any product, not a treatment promise, and not a substitute for medical advice. What may be stated on product labels, product pages, or in advertising is governed by the applicable legal requirements.