Moderate evidenceStress & mood

Lavender Extract (Silexan)

Silexan, a specific oral lavender oil preparation, has the strongest clinical dataset of any calming herbal — multiple large placebo-controlled RCTs showing meaningful anxiety reduction without sedation or dependence. The main caveat is that essentially all pivotal trials come from a single manufacturer, and generic lavender capsules are not the same product.

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What the science says

Reduces anxiety in anxiety disorders and subthreshold anxiety Moderate evidence
A meta-analysis of five randomised, placebo-controlled trials in roughly 2,200 patients found Silexan 80 mg/day produced a moderate reduction in Hamilton Anxiety Rating Scale scores versus placebo (standardised mean difference around -0.5). Effects appeared within about 2 weeks and were consistent across GAD, subthreshold anxiety and mixed anxiety/depression.
Comparable to an SSRI in generalised anxiety disorder Moderate evidence
In a 10-week trial of 539 GAD patients, both Silexan 80 mg and 160 mg reduced HAM-A scores significantly more than placebo, while the active comparator paroxetine 20 mg did not separate statistically from placebo. That is a striking result, but a failed active comparator arm also signals an underpowered or high-placebo-response trial, so it should not be read as proof that lavender beats SSRIs.
Improves anxiety-related sleep disturbance Moderate evidence
Sleep items within the HAM-A and secondary sleep scales improved in several Silexan trials, and the effect appears to follow anxiety reduction rather than direct sedation — participants did not report daytime drowsiness or hangover. Silexan has not been tested as a standalone treatment for primary insomnia.
Treats depression Limited evidence
A pooled analysis found improvement in co-occurring depressive symptoms in patients with anxiety, but this was in anxious populations where mood tracks anxiety. There is no adequate trial of Silexan as a treatment for major depressive disorder.

Dosage & safety

Studied dose80 mg once daily of the Silexan preparation (an oral lavender oil softgel standardised for linalool and linalyl acetate); 160 mg/day has been used for more severe anxiety with a similar safety profile. Trials ran 6-10 weeks, with onset of effect around 2 weeks. Ordinary lavender essential oil, tea or aromatherapy products have not been shown to reproduce these results and lavender essential oil must never be swallowed neat.

SafetyThe characteristic side effect is eructation — lavender-flavoured burping — which is dose-dependent and the main reason for unblinding concerns in trials. Otherwise adverse events were close to placebo rates, with no sedation, no cognitive impairment, no withdrawal and no dependence signal. Rare allergic reactions and GI upset occur. Case reports have linked lavender-containing products to prepubertal gynecomastia via possible weak endocrine activity; the evidence is contested but argues for caution in children. No adequate pregnancy or breastfeeding data. Silexan is sold as a licensed medicine (Lasea) in parts of Europe and only as a supplement elsewhere.

How to take it

TimingOnce daily at any time; many people prefer the evening so the burping happens while they are asleep.

With food?Taking it with a meal reduces the lavender-flavoured eructation that is its main side effect.

Worth knowingGive it two weeks - the effect builds rather than arriving on the first dose, and ordinary lavender oil or tea is not a substitute.

Frequently asked questions

Does lavender oil (Silexan) work for anxiety?

Silexan has moderate evidence: a meta-analysis of five trials in roughly 2,200 patients found 80 mg/day produced a moderate reduction in anxiety scores versus placebo, with effects within about 2 weeks. Essentially all pivotal trials come from a single manufacturer.

Is Silexan as effective as an SSRI?

In one 10-week trial of 539 patients with generalised anxiety disorder, Silexan beat placebo while paroxetine did not separate from placebo. That signals an underpowered or high-placebo trial, so it is not proof that lavender beats SSRIs.

Can I use regular lavender oil or tea instead of Silexan?

No: ordinary lavender essential oil, tea and aromatherapy products have not been shown to reproduce the Silexan results. Lavender essential oil must never be swallowed neat.

What are the side effects of Silexan lavender capsules?

The characteristic side effect of Silexan is lavender-flavoured burping; otherwise adverse events were close to placebo, with no sedation, withdrawal or dependence signal. Taking it with a meal or in the evening reduces the burping.

Scientific references

Efficacy of Silexan in patients with anxiety disorders: a meta-analysis of randomized, placebo-controlled trials
Dold M, Bartova L, Volz HP, et al. — European Archives of Psychiatry and Clinical Neuroscience, 2023
Lavender oil preparation Silexan is effective in generalized anxiety disorder--a randomized, double-blind comparison to placebo and paroxetine
Kasper S, Gastpar M, Müller WE, et al. — International Journal of Neuropsychopharmacology, 2014

Where to buy

Integrative Therapeutics, Lavela WS 1265™, 60 Softgels (80 mg per Softgel)

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