Lavender Research

By outcome

• Anxiety & stressSignificant reduction in state and trait anxiety scores · 1–4 weeks · Lower cortisol response and reduced perceived stress · 2–4 weeks

  Mostly mechanism / observational51 studies
• Sleep & insomniaReduced sleep latency and improved subjective sleep onset · 1–2 weeks · Improved subjective sleep continuity (largely anxiety-mediated) · 2–4 weeks · Modest subjective sleep-quality improvement (no proven sleep-architecture change) · 2–4 weeks

  Mostly mechanism / observational23 studies
• Depression & moodReduction in depressive symptom scores · 4–8 weeks

  Mostly mechanism / observational12 studies
• Cognitive function

  Mostly mechanism / observational6 studies
• Safety profile

  Too few graded studies1 study