Research synthesisModerate evidenceModerate effect4 studies · 4 beneficial · 0 neutral · 0 harmful
Across all 4 studies, lavender aromatherapy shows moderate evidence for reducing fatigue, with all 4 reporting beneficial effects and statistically significant results. The predominant effect size was moderate across 3 studies and large in 1 study. The most-studied dose was nightly inhalation of lavender essential oil, and the median study duration was 18 days, suggesting benefits can appear within weeks in clinical populations.
- Effective dose range: nightly inhalation of lavender essential oil (e.g., 15-minute sessions or 2 minutes before bed, for 5-28 days)
- Studied populations: clinical populations: hypertensive adults, patients with hematological malignancies undergoing chemotherapy, ICD patients, and patients with chronic heart failure
Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Evidence base is small (only 4 studies) — conclusions should be considered preliminary. All studies used inhalation of lavender essential oil, so findings may not generalize to other forms (e.g., oral supplements).
Generated Jul 16, 2026