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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Lavender and Reduced Depression Symptoms

Research synthesisLow evidenceMixed effect size4 studies · 3 beneficial · 1 neutral · 0 harmful

Across 4 studies, 3 reported beneficial effects of lavender on reducing depression symptoms, with effect sizes ranging from small to moderate. The only randomized controlled trial (RCT) found a neutral effect (no significant difference), while systematic reviews support benefit. The median study duration was 28 days, but only one study reported duration. No specific dose or form was consistently reported across studies.

  • Studied populations: breast cancer survivors undergoing chemotherapy (one RCT)

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. The only RCT found a neutral effect, while systematic reviews (which may include overlapping or lower-quality studies) reported benefit; this discrepancy limits confidence.

Generated Jul 9, 2026
Time to effect
Median: 4 weeks · IQR 4 weeks–4 weeks · Range 4 weeks–4 weeks — Reported in 1 of 4 studies
Safety in these studies
4 of 4 papers
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