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LAV7.2
Lavender Research
Mostly mechanism / observationalHigh safety
28 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most Lavender studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2010–2026 with a typical study size of 70 participants.
Based on 28 studies · 16 meta-analyses · 8 RCTs · 868 total participants
Confidence
High
By outcome
Anxiety & stressSignificant reduction in state and trait anxiety scores · 1–4 weeks · Lower cortisol response and reduced perceived stress · 2–4 weeks
Depression & moodReduction in depressive symptom scores · 4–8 weeks
Mostly mechanism / observational7 studies
Cognitive function
Too few graded studies1 study
Active research area
21 studies in the last 5 years · Latest meta-analysis: 2026
201020182026
1RCTn=498 · medium study2025
Silexan 80 mg/day was superior to placebo and comparable to sertraline 50 mg/day in reducing depression scores in patients with major depressive disorder.
Kasper S et al. · European archives of psychiatry and clinical neuroscience (2025)
Silexan significantly reduced MADRS depression scores vs placebo over 8 weeks
Efficacy was comparable to sertraline 50 mg/day as an active reference
Response rates (≥50% MADRS reduction) were higher with Silexan vs placebo
Silexan 80 mg/day was as effective as lorazepam 0.5 mg/day in generalized anxiety disorder, with significant and comparable reductions in HAMA scores, without sedation or abuse potential.
Woelk H et al. · Phytomedicine : international journal of phytotherapy and phytopharmacology (2010)
Silexan 80 mg/day reduced HAMA total scores by 45% vs 46% for lorazepam 0.5 mg/day (non-inferior)
Sleep-related outcomes improved and were comparable between Silexan and lorazepam
No sedation or abuse potential was observed with Silexan, unlike lorazepam
Lavender preparations significantly reduced anxiety compared to placebo or control, supporting their use as a clinically relevant anxiolytic intervention.
Donelli D et al. · Phytomedicine : international journal of phytotherapy and phytopharmacology (2019)
Meta-analysis confirmed significant anxiolytic effects of lavender across multiple administration routes
Both oral Silexan and aromatherapy inhalation demonstrated significant reductions in anxiety scores
Effects were consistent across diverse clinical populations including pre-surgical, ICU, and anxiety disorder patients
Silexan produced significant and clinically relevant anxiolytic effects in patients with subthreshold anxiety, making it a suitable treatment option for this large and underserved population.
Möller HJ et al. · European archives of psychiatry and clinical neuroscience (2019)
Silexan 80 mg/day significantly reduced HAMA scores compared to placebo in subthreshold anxiety
Secondary outcomes including sleep quality and quality of life also significantly improved
Response rates were meaningfully higher with Silexan versus placebo
Network meta-analysis demonstrated that lavender essential oil produced moderate effect sizes for reducing state anxiety (WMD −5.41) and trait anxiety (WMD −5.5) compared to control.
Tan L et al. · Frontiers in public health (2023)
Lavender reduced State Anxiety Inventory scores by WMD −5.41 (95% CrI −7.86, −2.98) in network meta-analysis
Trait anxiety scores were reduced by WMD −5.5 (95% CrI −8.7, −2.46) with lavender
Silexan 80 mg/day significantly improved co-occurring depressive symptoms in patients with anxiety, supporting its dual anxiolytic and antidepressant profile.
Bartova L et al. · European archives of psychiatry and clinical neuroscience (2023)
Silexan significantly reduced depressive symptom scores alongside anxiety in pooled RCT data
Effect on depression was independent of its anxiolytic effects, suggesting a direct antidepressant mechanism
Response rates for depressive symptoms were significantly higher with Silexan vs placebo
Lavender significantly reduced anxiety across multiple patient populations and administration methods, with the strongest evidence for oral Silexan in GAD.
Kang HJ et al. · Asian nursing research (2019)
Lavender aromatherapy significantly reduced anxiety in RCTs across multiple clinical settings
Oral Silexan showed the strongest effect sizes for clinically defined anxiety disorders
Both inhalation and oral routes demonstrated statistically significant anxiolytic effects
Aromatherapy, predominantly using lavender oil, significantly improved sleep quality in older adults, with a pooled standardized mean difference indicating a moderate-to-large effect.
Xu K et al. · Medicine (2024)
Pooled analysis demonstrated significant improvement in PSQI sleep quality scores in older adults
Lavender was the most studied and consistently effective essential oil for sleep in the elderly
Inhalation aromatherapy was the dominant and effective administration method
Aromatherapy, particularly lavender-based inhalation, significantly improved sleep quality in both adults and elderly individuals across multiple clinical trials.
Her J et al. · Complementary therapies in medicine (2021)
Aromatherapy significantly improved sleep quality scores compared to control conditions
Lavender was the most commonly studied essential oil for sleep outcomes
Effects were consistent across adults and elderly populations
Lavender significantly reduced anxiety and depression scores and improved physiological parameters including heart rate and blood pressure across diverse clinical populations.
Kim M et al. · Asian nursing research (2021)
Lavender significantly reduced anxiety scores (standardized mean difference statistically significant)
Depression scores were also significantly reduced with lavender interventions
Physiological markers including heart rate and blood pressure were significantly improved
Lavender essential oil significantly improved sleep quality in adults, with pooled analysis supporting its use as a non-pharmacological sleep intervention.
Shen H et al. · Holistic nursing practice (2026)
Pooled meta-analysis showed significant improvement in objective and subjective sleep quality with lavender essential oil
Inhalation was the most effective and commonly used route for sleep enhancement
Effects were consistent across healthy adults and clinical populations with insomnia
Lavender's primary bioactive constituents linalool and linalyl acetate modulate GABA-A receptor activity, providing a mechanistic basis for its anxiolytic and sleep-promoting effects.
Bruni O et al. · Nutrients (2021)
Linalool acts as a positive allosteric modulator of GABA-A receptors, enhancing inhibitory neurotransmission
Lavender's GABAergic mechanism underlies its documented anxiolytic and sedative clinical effects
Herbal preparations acting on GABA including lavender showed consistent sleep-promoting properties in review
Clinician-guideline nutraceutical review assessed chamomile among agents for psychiatric symptoms.
Sarris J et al. · The world journal of biological psychiatry : the official journal of the World Federation of Societies of Biological Psychiatry (2022)
A narrative/systematic review concluded Silexan improves sleep largely AS A CONSEQUENCE of its anxiolytic effect, not via a direct sleep-promoting action.
Seifritz E et al. · The world journal of biological psychiatry : the official journal of the World Federation of Societies of Biological Psychiatry (2022)
Silexan improved PSQI scores in anxiety RCTs
>98% of the sleep benefit was mediated by anxiety reduction (direct sleep effect marginal)
Supports use for anxiety-related sleep complaints, not primary insomnia