What the evidence says. Graded strong for the Silexan preparation specifically: a 2023 meta-analysis of 5 RCTs (n=1213) plus head-to-head trials show it consistently beats placebo and matches lorazepam and paroxetine for anxiety. The caveat is that this evidence applies only to this proprietary, manufacturer-funded product — generic lavender capsules, teas, or aromatherapy are not interchangeable. (Strong evidence: Multiple high-quality RCTs / meta-analyses with consistent effects.)
What is Lavender (Silexan)?
Lavender (Silexan) (Lavandula angustifolia) is a sleep and mood supplement used for reduce anxiety symptoms. NutriDex grades the human evidence as Strong. Silexan is a standardized softgel of lavender essential oil (Lavandula angustifolia) taken by mouth, distinct from aromatherapy or culinary lavender. Across five double-blind RCTs (1,213 patients), it reduced Hamilton Anxiety (HAMA) scores about 2.9 points more than placebo, a modest-to-moderate effect (standardized mean difference ~0.35). In generalized anxiety disorder, 160 mg/day lowered HAMA by ~14 points and worked as well as 0.5 mg lorazepam and 20 mg paroxetine, without sedation or dependence. Subthreshold-anxiety and mixed anxiety-depression trials also showed benefit, including better sleep quality (PSQI), likely secondary to reduced anxiety rather than a direct hypnotic effect. A 2024 trial found a small antidepressant signal in mild-to-moderate depression. The main limits: nearly all trials are funded by the manufacturer, durations are ~10 weeks, and results do not generalize to other lavender forms.
Purported Benefits
✓Reduce anxiety symptoms
✓Ease restlessness & worry
✓Improve sleep quality
✓Lift mild-to-moderate low mood
Evidence by outcome
The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.
Sleep qualityPSQI improved in subsyndromal-anxiety RCT, likely secondary to reduced anxiety rather than direct hypnotic effect.
Moderate
↑ benefit · small
1
Mild-to-moderate depression2024 RCT (n=498) found MADRS 2.2 pts better than placebo, similar to 50 mg sertraline; single trial.
Preliminary
↑ benefit · small
1
Dosing & Compounds
Typical Dose
80–160 mg/day of the standardized oral preparation Silexan (one soft-gel capsule), with 160 mg/day used for generalized anxiety disorder.
Active Compounds
LinaloolLinalyl acetate
Safety & Cautions
⚠
Silexan is well tolerated; the most common side effect is eructation (burping) with a lavender taste or breath odour, plus occasional nausea or mild GI upset — roughly 3% above placebo. Unlike benzodiazepines it has not shown sedation, dependence, abuse potential, or withdrawal in trials, including a dedicated abuse-liability study. Human drug-interaction data are limited; theoretical caution is reasonable when combining with other sedatives or CNS depressants, and it should be avoided in pregnancy and breastfeeding due to insufficient safety data. Discuss with a clinician before substituting it for a prescribed anxiety or depression medication. Educational only — always check with your doctor or pharmacist before combining Lavender (Silexan) with any medicine.
Lavender (Silexan) drug interactions
Known or theoretical interactions between Lavender (Silexan) and common medications — educational, not exhaustive. Always check with your doctor or pharmacist before combining Lavender (Silexan) with any medicine.
Lavender (Silexan) is most often taken for Reduce anxiety symptoms, Ease restlessness & worry, Improve sleep quality, Lift mild-to-moderate low mood. A standardized oral lavender oil with real anxiolytic data.
Does Lavender (Silexan) work — what does the evidence say?
Strong evidence. Multiple high-quality RCTs / meta-analyses with consistent effects. Silexan is a standardized softgel of lavender essential oil (Lavandula angustifolia) taken by mouth, distinct from aromatherapy or culinary lavender. Across five double-blind RCTs (1,213 patients), it reduced Hamilton Anxiety (HAMA) scores about 2.9 points more than placebo, a modest-to-moderate effect (standardized mean difference ~0.35). In generalized anxiety disorder, 160 mg/day lowered HAMA by ~14 points and worked as well as 0.5 mg lorazepam and 20 mg paroxetine, without sedation or dependence. Subthreshold-anxiety and mixed anxiety-depression trials also showed benefit, including better sleep quality (PSQI), likely secondary to reduced anxiety rather than a direct hypnotic effect. A 2024 trial found a small antidepressant signal in mild-to-moderate depression. The main limits: nearly all trials are funded by the manufacturer, durations are ~10 weeks, and results do not generalize to other lavender forms.
What is the typical dose of Lavender (Silexan)?
80–160 mg/day of the standardized oral preparation Silexan (one soft-gel capsule), with 160 mg/day used for generalized anxiety disorder.
Is Lavender (Silexan) safe? Any cautions or side effects?
Silexan is well tolerated; the most common side effect is eructation (burping) with a lavender taste or breath odour, plus occasional nausea or mild GI upset — roughly 3% above placebo. Unlike benzodiazepines it has not shown sedation, dependence, abuse potential, or withdrawal in trials, including a dedicated abuse-liability study. Human drug-interaction data are limited; theoretical caution is reasonable when combining with other sedatives or CNS depressants, and it should be avoided in pregnancy and breastfeeding due to insufficient safety data. Discuss with a clinician before substituting it for a prescribed anxiety or depression medication.
How many studies support Lavender (Silexan)?
NutriDex cites 10 sources for Lavender (Silexan), graded "Strong".
Does Lavender (Silexan) interact with any medications?
Yes — known or theoretical interactions include: Sedatives (benzodiazepines, opioids, alcohol) (monitor). This is educational and not exhaustive; always check with your doctor or pharmacist before combining Lavender (Silexan) with any medicine.
Cite this page
APA
Peh, D. (2026). Lavender (Silexan) (Lavandula angustifolia): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 16 Sept 2026, from https://nutridex.info/s/lavender
BibTeX
@misc{nutridex_lavender,
author = {Peh, Daryl},
title = {Lavender (Silexan) (Lavandula angustifolia): Benefits, Dosage, Side Effects \& Evidence},
year = {2026},
howpublished = {NutriDex --- The Supplement Research Compendium},
url = {https://nutridex.info/s/lavender},
note = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-09-16}
}
For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.