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Lavandula angustifolia (Lavender Essential Oil / Silexan)
Aromatic botanical with well-documented anxiolytic, sleep-promoting, and mood-supporting effects. In one 77-person trial, anxiety scores fell 45% on oral Silexan and 46% on low-dose lorazepam, with no test of the difference reported, which does not show it can replace a prescribed anxiolytic.
What the evidence says
Lavender doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 2001–2026 with a typical study size of 697 participants.
Based on 187 studies · 25 meta-analyses · 137 RCTs · 6,459 total participants
Confidence
High confidenceBy outcome
Many meta-analyses and RCTs consistently support anxiolytic effects, with anxiety scores falling 45% on oral Silexan and 46% on lorazepam in one 77-person GAD trial (no between-group test reported), and Silexan beating placebo for depression. Sleep benefits are largely anxiety-mediated rather than a direct effect.
57 trials ongoing or recruiting · 160 completed on ClinicalTrials.gov
16 of the completed trials have posted results
Registered trials show research momentum for Lavender, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Lavender (Lavandula angustifolia Mill.) is an aromatic botanical with clinical evidence supporting its use for anxiety reduction, sleep improvement, and mood support.
The standardized oral preparation Silexan (80 mg/day) was compared head-to-head with lorazepam 0.5 mg in 77 adults with generalized anxiety disorder, and anxiety scores fell by 45% and 46%. The abstract reports no test of the difference between the groups and no non-inferiority test, and it is a single trial.
Meta-analyses of aromatherapy by inhalation or massage also find lower anxiety and better sleep in many clinical settings, but most of those trials are at high risk of bias and vary widely in design.
Key bioactive constituents include linalool and linalyl acetate, which modulate GABA-A receptors and reduce autonomic nervous system arousal.
Lavender is generally recognized as safe, with a favorable tolerability profile though a debated estrogenic signal warrants caution with essential-oil use in prepubertal children.
Linalool and linalyl acetate are proposed to act on GABA-A receptors, the same receptor family benzodiazepines target. A 2021 systematic review says herbal extracts may exert some of their anxiolytic and hypnotic activity through GABA receptors but that the mechanism is not completely understood. In the 77-person lorazepam comparison, Silexan showed no sedative effects. Referenced in PMID:33561990.
Pooled trials of lavender aromatherapy report lower systolic blood pressure, heart rate and salivary cortisol (PMID:31743795), although a later meta-analysis found the physiological effects small and inconsistent, with only systolic blood pressure significant (PMID:34775136). A network meta-analysis reported falls in systolic blood pressure (WMD −6.83 mmHg) and heart rate (WMD −3.43 bpm) for essential oils as a group, not lavender alone (PMID:37325306).
Silexan inhibits voltage-gated calcium channels and modulates serotonin (5-HT1A) receptor activity, contributing to antidepressant and anxiolytic effects. Referenced in PMID:19962288 and PMID:29464801.
In pooled trials of lavender aromatherapy, salivary cortisol fell (Hedges' g −1.29, PMID:31743795). Whether this reflects a lasting change in HPA-axis reactivity has not been shown in the cited studies.
Lavender may reduce arousal and improve subjective sleep quality, largely secondary to its anxiolytic and autonomic effects rather than a proven change in sleep architecture.
How Lavender works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Aromatherapy inhalation appears generally safe in pregnancy for labor anxiety (several RCTs). Oral Silexan has insufficient safety data in pregnancy. Avoid high-dose oral lavender during pregnancy. Topical use generally considered safe when diluted.
Caution: case reports of gynecomastia in prepubertal boys with lavender product exposure (possible weak estrogenic/anti-androgenic activity). Avoid regular topical lavender products in young children. Inhalation aromatherapy appears lower risk. PMID:39208995 reviewed endocrine disruption concern.
Evidence for anxiety and sleep in older adults is preliminary. Lower starting doses recommended. Monitor for excessive sedation or falls risk.
Silexan may be used adjunctively with SSRIs but monitor for additive sedation. Discuss with prescriber before combining with benzodiazepines.
High-concentration aromatherapy inhalation may trigger bronchospasm in susceptible individuals. Use lower concentrations and ensure adequate ventilation.
Additive CNS depression and sedation; use with caution and reduce doses of sedative medications if combining
GABAergic activity of lavender may theoretically augment antiepileptic effects
Lavender modestly lowers blood pressure; monitor for additive hypotensive effect
Tip: Take oral Silexan with food
Tip: Common with encapsulated oil; usually resolves after first 1–2 weeks
Tip: Take in the evening; avoid driving if drowsy
Tip: Use a properly formulated product according to its label; a carrier oil alone does not establish a safe dilution. A small-area home use test may reveal irritation, but a negative result does not rule out immediate or delayed allergy, future sensitisation or systemic reactions. Do not test or re-expose yourself to a known or suspected culprit. Stop use if a reaction develops; an allergist or dermatologist can assess suspected allergy.
Tip: Reduce inhalation concentration or duration
Lavender has an evidence score of 7.2/10 — strong evidence based on 187 indexed studies, including 15 meta-analyses. Aromatic botanical with well-documented anxiolytic, sleep-promoting, and mood-supporting effects. In one 77-person trial, anxiety scores fell 45% on oral Silexan and 46% on low-dose lorazepam, with no test of the difference reported, which does not show it can replace a prescribed anxiolytic. Representative study: PMID 36717399.
The commonly studied dose of Lavender is 80 mg oral Silexan daily OR aromatherapy inhalation 30–60 min sessions. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Lavender is before bed. Take it with food. Oral Silexan has a half-life of approximately 2–3 hours for peak plasma linalool, but anxiolytic effects accumulate over days–weeks of daily dosing.
Lavender is generally well-tolerated and considered safe for most healthy adults at recommended doses. Reported side effects include contact dermatitis (topical), nausea / GI discomfort, burping / eructation. How often they occur is not established for all of them. Use caution if any of these apply to you: Known hypersensitivity or allergy to lavender or Lamiaceae family plants; Prepubertal children (lavender products associated with case reports of gynecomastia — endocrine disruption risk); Undiluted topical application (can cause contact dermatitis and sensitization).
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L-Theanine
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Kava
Probably helpsKavalactones are studied for anxiety. A Cochrane review of 11 placebo-controlled trials found kava extract lowered anxiety scores more than placebo, but no trial cited here shows it works as well as a prescription anti-anxiety medication.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 188 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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