What is the standard Silexan lavender dosage?

The dose used in most clinical trials is 80 mg of Silexan once daily, taken as a single oral capsule of the standardised lavender oil. Some studies of more pronounced anxiety symptoms used 160 mg per day. Because 80 mg is the dose with the widest evidence base, it is the usual starting point, with any increase left to a clinician's judgement.

When should I take Silexan and how long until it works?

Silexan is taken once a day, and many people take it in the morning to reduce the mild burping sometimes reported with lavender oil. Trials generally measured benefit over two to six weeks, so it is not an on-the-spot calming agent. Give it a fair run of several weeks at a steady daily dose before deciding whether it helps.

Is 160 mg of Silexan safe?

The 160 mg daily dose has been studied and was generally well tolerated in trials, with lavender-scented burping being the most common complaint. Higher does not automatically mean better, though. Because anxiety is a condition that warrants proper assessment, moving beyond 80 mg is a decision to make with a clinician rather than on your own.

How is Silexan different from ordinary lavender oil?

Silexan is a specific, patented oral lavender oil preparation standardised to set levels of its two main components, linalool and linalyl acetate. Generic lavender capsules or aromatherapy oils are not the same product and were not the ones tested in the trials. If you are trying to match the research, the standardisation is what matters, not simply the word lavender.

What is the best lavender oil supplement for anxiety?

Look for an oral preparation that names its standardisation, ideally the 80 mg Silexan form used in trials, states the linalool and linalyl acetate content, and carries third-party testing. If you would rather use a better-stocked adaptogen with strong anxiety evidence, our ashwagandha page and anxiety guide cover the alternatives and how to choose.

ashwagandha

Moderate evidence

Silexan Lavender Dosage: How Much?

Silexan lavender dosage explained: the 80 mg capsule used in anxiety trials, when to take it, how long it works, and how it differs from generic lavender.

July 25, 2026

Updated July 2026

Reviewed by Enoch C., MSc — Research & Editorial

On this page

The dose the trials actually used
Timing and how long to give it
Silexan versus generic lavender
What to look for in a lavender oil supplement for anxiety
Cautions and interactions
Sources

Silexan is a patented oral preparation of lavender (Lavandula angustifolia) oil, standardised so that each capsule delivers a consistent amount of the plant’s two active components, linalool and linalyl acetate. Unlike an aromatherapy oil meant for a diffuser, this is a swallowed softgel developed and tested for easing everyday anxiety symptoms. The dose that carries the most evidence is 80 mg once daily, with some trials of stronger symptoms using 160 mg per day. Below is what the research actually tested, when to take it, and how it compares with other calming options.

If steady daily anxiety support is what you are after, lavender is one route and adaptogens are another. Our ashwagandha page and anxiety guide cover the better-stocked alternatives, and this post stays focused on getting the Silexan dose right.

The dose the trials actually used

Almost all of the clinical work on Silexan settled on a single daily capsule. A double-blind trial by Kasper and colleagues (2010) tested 80 mg per day against placebo in adults with subsyndromal anxiety and reported meaningful reductions in restlessness and disturbed sleep over ten weeks. A later comparison by Kasper and colleagues (2014) put 160 mg of Silexan up against a low dose of the antidepressant paroxetine and against placebo in generalised anxiety, again taken once daily.

Pulling those studies together, a meta-analysis by Generoso and colleagues (2017) concluded that Silexan outperformed placebo for anxiety symptoms across the trials, with 80 mg as the common dose and 160 mg reserved for more pronounced presentations. The practical read is simple: 80 mg once a day is the evidence-backed starting dose, and the jump to 160 mg belongs in a clinician’s hands.

Timing and how long to give it

Silexan is taken once daily, and many people take it in the morning with water. The main reason is comfort rather than effect: like several oral botanical oils, it can cause a mild lavender-scented burp, which a morning dose and a full glass of water tend to soften. Splitting the capsule is not the practice the studies followed, so a single daily dose is the pattern to copy.

This is not a supplement that works the moment you swallow it. The trials measured change over two to six weeks, with benefits building gradually rather than arriving on the first evening. If you are looking for immediate calm before a specific event, Silexan is the wrong tool. Its value shows up when it is taken steadily, day after day, for at least a few weeks. Set that expectation before you start and you are less likely to abandon it too early or reach for a higher dose out of impatience.

Silexan versus generic lavender

A recurring mistake is treating any lavender capsule as interchangeable with Silexan. It is not. The Examine summary of lavender notes that the anxiety evidence rests specifically on this standardised oral oil, not on aromatherapy or unstandardised capsules. Generic products vary widely in how much linalool and linalyl acetate they contain, and the NCCIH overview of lavender is careful to say that most claims for other forms are not well supported. If your aim is to reproduce the research, matching the standardisation is what counts.

What to look for in a lavender oil supplement for anxiety

If you decide to try lavender, the label is where the useful information lives. Prioritise an oral preparation, not an essential oil sold for diffusing, since only swallowed, standardised oil was tested. Check that it states the 80 mg standardised dose and names the linalool and linalyl acetate content, the two markers that define the studied product. Third-party testing for purity matters more here than any calming imagery on the box. If lavender turns out to be hard to source in a standardised form, a well-studied adaptogen may be the more practical choice: our ashwagandha page explains the evidence, and the anxiety guide shows how the options line up. The rule holds across both: buy on stated standardisation and testing, not on brand promises.

Cautions and interactions

Silexan is generally well tolerated, with lavender-scented burping the most common report. It may add to the effect of sedatives, and its safety in pregnancy and breastfeeding has not been established, so those groups should avoid it. Because anxiety can have medical causes and can overlap with other conditions, ongoing or severe symptoms deserve a proper assessment rather than self-treatment. Talk to your prescriber or pharmacist before starting Silexan if you take any medication, and before moving above 80 mg per day.

Sources

Kasper S, Gastpar M, Müller WE, et al. Silexan, an orally administered Lavandula oil preparation, is effective in the treatment of ‘subsyndromal’ anxiety disorder. Int Clin Psychopharmacol. 2010. doi:10.1097/YIC.0b013e32833b3242
Kasper S, Gastpar M, Müller WE, et al. Lavender oil preparation Silexan is effective in generalized anxiety disorder. Int J Neuropsychopharmacol. 2014. doi:10.1017/S1461145714000017
Generoso MB, Soares CN, Taiar IT, et al. Lavender oil preparation (Silexan) for treating anxiety: a systematic review and meta-analysis. J Clin Psychopharmacol. 2017. doi:10.1097/JCP.0000000000000629
National Center for Complementary and Integrative Health. Lavender. nccih.nih.gov
Examine. Lavender: evidence summary. examine.com

This article is educational and not medical advice. Supplements support, not treat, mood, stress, and sleep. Anxiety that is ongoing or severe deserves professional assessment. See our disclaimer and get help.