The Herbarium · Roots & botanicals
Kava
Piper methysticum · root
A root with a long Pacific story.
Plant wisdom · evidence at a glance
Potential benefits
What researchers have found, how strong the evidence is, and where questions remain. Findings apply to the preparation studied—not automatically to products on our shelves.
Human research · mixed results
Calm & relief from anxiety symptoms
Some short-term trials of specific kava extracts found reduced anxiety symptoms. A larger 16-week trial in people with generalized anxiety disorder found no significant benefit over placebo. This supports cautious interest in calming effects, not a reliable treatment claim for anxiety disorders.
Traditional practice · not a clinical outcome
A social, alcohol-free ritual
Kava has a long history as a communal Pacific beverage. Its place in a social ritual is distinct from evidence of a medical benefit, and a water-based preparation does not eliminate liver risk.
Open the field notes
Kava begins with a plant, a place, and a tradition. The root of Piper methysticum is associated with communal beverages across Pacific cultures. A modern canned drink or concentrated extract is a different preparation from a traditional bowl of kava.
On the apothecary shelf
You may encounter kava in drinks, powders, and extracts. Compare the actual ingredients and preparation rather than treating every kava product as interchangeable. A beverage may contain other botanicals, sweeteners, or ingredients that matter just as much as the name on the front.
Into the research library
Follow the scholarship behind the curiosity. These peer-reviewed papers examine specific ingredients or preparations—not TOP products. Human trials, research reviews, and preclinical studies answer different questions. A link is not a promise of benefit or a recommendation to treat a condition.
Human randomized trial
Kava extract and generalized anxiety ↗Sarris J et al. · J Clin Psychopharmacol · 2013 Oct · PMID 23635869
Human randomized trial
Longer-term kava trial: no significant benefit ↗Sarris J et al. · Aust N Z J Psychiatry · 2020 Mar · PMID 31813230
Human trial safety analysis
Kava adverse effects and liver tests ↗Sarris J et al. · Phytother Res · 2013 Nov · PMID 23348842
Human randomized crossover trial
The Kava Anxiety Depression Spectrum Study ↗Sarris J et al. · Psychopharmacology (Berl) · 2009 Aug · PMID 19430766
Read each paper's methods, limitations, funding, and conflict-of-interest disclosures. Animal and cell findings do not establish benefits in people; a review may include the same trials as another review. PubMed links provide abstracts and full-text links where available.
Sources & further reading
NCCIH: Kava ↗These independent references inform our educational notes. They are not endorsements of TOP or of any product. Notes reviewed October 31, 2026.
For adults 21+. Educational information, not medical advice. Our team can help you read labels and locate lab reports. A qualified health professional should advise on medicines, health conditions, pregnancy, or breastfeeding. Ask a veterinarian before using any product with a pet. Availability varies; an educational page does not mean an ingredient is currently in stock.