Kava is the most thoroughly studied plant for anxiety. Pacific Island cultures have used it for thousands of years to relax and connect, and clinical trials have found that kava extract can ease anxiety symptoms compared with placebo — with some honest caveats. Here is what kava does, what the research shows, and how to use it well.
How Kava Works for Anxiety
Kava root contains active compounds called kavalactones. Researchers believe they calm the nervous system in several ways at once:
- GABA-A receptors. Kavalactones appear to enhance activity at GABA-A receptors, the brain’s main “calming” system — the same broad system targeted by anti-anxiety medications, though kava acts differently from benzodiazepines.
- Nerve excitability. Some kavalactones dampen sodium and calcium channel activity, reducing how readily nerves fire.
- Other neurotransmitters. Laboratory studies suggest effects on noradrenaline and dopamine signaling, which may contribute to kava’s mood-lifting quality.
Exactly how these combine is still being studied. What people describe is consistent, though: muscle tension eases, a racing mind quiets, and mood lifts, while thinking stays clear. In the Pacific, kava’s social ease has earned it a reputation as the drink that brings people together.
What the Research Shows
Kava has been tested for anxiety more than any other herb. Most trials used standardized kava extracts rather than traditional drinks.
- Cochrane review (Pittler & Ernst). Pooling randomized, placebo-controlled trials, the review concluded that kava extract appears to be an effective short-term treatment for anxiety compared with placebo, with mild and infrequent side effects.
- WS 1490 meta-analysis (Witte et al., 2005). Six placebo-controlled trials with 345 patients with non-psychotic anxiety disorders found kava extract significantly more likely than placebo to produce a successful treatment response.
- Systematic review of herbal remedies (Ernst, 2006). Of the herbs reviewed for anxiety, kava had by far the strongest evidence, with consistent results across independent research groups.
- KADSS trial (Sarris et al., 2009). In 60 adults with generalized anxiety, a water-soluble extract of noble kava significantly reduced anxiety compared with placebo, with no serious adverse effects.
- KAV-GAD trial (Sarris et al., 2013). A six-week randomized trial in 75 people with generalized anxiety disorder found a significant reduction in anxiety with kava versus placebo, and kava was well tolerated.
The Honest Caveats
Not every study is positive. A small 2002 trial (Connor & Davidson) found no difference from placebo, and the largest trial to date — a 16-week study of 171 people with generalized anxiety disorder published in 2020 — also found kava no better than placebo overall, with more mild liver enzyme changes in the kava group. The evidence is strongest for short-term relief of mild to moderate anxiety, and results vary from person to person.
Everyday, Social and Situational Anxiety
Everyday Worry
For a busy mind and a tense body at the end of the day, a regular kava ritual can make unwinding easier. Learn more in our guide to kava for stress.
Social Anxiety
Kava’s traditional role is social: it eases shyness and tension while keeping conversation clear. See kava for social anxiety.
Situational Anxiety
Before a flight, a presentation or a difficult conversation, many people use kava as needed rather than daily. Effects typically begin within 20–30 minutes.
When anxiety keeps you up at night, see kava for sleep.
Which Kava Is Best for Anxiety?
Choose noble kava. Noble cultivars are the traditional drinking varieties with a predictable effect profile. Avoid non-noble “tudei” kava, which is more likely to cause nausea and next-day heaviness. Kava.com sells noble kava only.
Heady vs. heavy. For daytime anxiety, many people prefer heady or balanced varieties, typically richer in kavain, which calm the mind without much sedation. Heavy varieties, richer in dihydrokavain and dihydromethysticin, are more body-focused and better for evenings.
Pick a form that fits your routine:
- Traditional kava powder — the full-spectrum root drink, kneaded in water. See how to prepare kava.
- Micronized and instant kava — stir into water with no straining.
- Capsules — consistent servings, slower onset (30–60 minutes), longer-lasting.
- Tinctures and pastes — fast-acting and convenient for situational use.
Browse our recommendations in the best kava for anxiety, or try ‘Awa Calm capsules, which combine kava extract with traditional calming herbs.
How to Use Kava for Anxiety Safely
- Start low. Begin with a small serving and increase gradually. Clinical trials have generally used 120–280 mg of kavalactones per day. Our kava dosage guide explains serving sizes.
- Give it a few tries. Some first-time drinkers of traditional kava notice little effect until their second or third session.
- Take breaks. Many people use kava a few days a week, or as needed, rather than continuously.
- Skip alcohol. Combining kava with alcohol increases sedation and liver load.
- Do not drive until you know how kava affects you.
- Talk to your doctor first if you take anti-anxiety medications, antidepressants, sedatives, anticonvulsants, levodopa or any medication processed by the liver; if you have liver disease; or if you are pregnant or breastfeeding. Never stop a prescribed medication without medical guidance.
Kava has a strong safety record when it is noble, root-only and used sensibly. Read the full evidence in kava and liver safety.
Kava for Anxiety: Common Questions
Does kava work for anxiety?
For many people, yes. Several placebo-controlled trials and a Cochrane review found kava extract reduced anxiety symptoms, particularly short-term and for mild to moderate anxiety. Not every trial has been positive, and responses vary.
How fast does kava work for anxiety?
Kava drinks, tinctures and pastes usually take effect within 20–30 minutes, peaking around an hour. Capsules take a little longer. Effects typically taper over two to four hours.
Is kava tea good for anxiety?
Kava tea can be a gentle way to unwind, but tea bags are usually much milder than traditional kava or standardized extracts. Check the kavalactone content if you want a noticeable effect.
Is kava addictive?
Kava has not been shown to cause dependence or withdrawal in clinical studies, which is one reason people are interested in it. Moderate use with regular breaks is still recommended.
Can kava replace anxiety medication?
Do not replace or stop prescribed medication on your own. Kava can interact with anti-anxiety and other medications, so talk to your doctor about whether it is appropriate for you.
What is the best kava for anxiety?
Noble kava, with a heady or balanced profile for daytime and a heavier profile for evenings. See our best kava for anxiety picks.
Note: This page is for educational purposes only and is not medical advice. Kava is not intended to diagnose, treat, cure or prevent any disease. If you have an anxiety disorder, work with a qualified healthcare provider, and consult them before using kava — especially if you take medications or have a liver condition.
References: Pittler MH, Ernst E. Kava extract for treating anxiety. Cochrane Database of Systematic Reviews. | Witte S, Loew D, Gaus W (2005). Meta-analysis of the efficacy of the acetonic kava-kava extract WS 1490 in patients with non-psychotic anxiety disorders. Phytotherapy Research, 19, 183–188. | Ernst E (2006). Herbal remedies for anxiety — a systematic review of controlled clinical trials. Phytomedicine, 13, 205–208. | Sarris J et al (2009). The Kava Anxiety Depression Spectrum Study (KADSS). Psychopharmacology, 205, 399–407. | Sarris J et al (2013). Kava in the treatment of generalized anxiety disorder: a double-blind, randomized, placebo-controlled study. Journal of Clinical Psychopharmacology, 33, 643–648. | Connor KM, Davidson JRT (2002). A placebo-controlled study of kava kava in generalized anxiety disorder. International Clinical Psychopharmacology, 17, 185–188. | Sarris J et al (2020). Kava for generalised anxiety disorder: a 16-week double-blind, randomised, placebo-controlled study. Australian & New Zealand Journal of Psychiatry, 54, 288–297.
Find Your Calm With Noble Kava
Noble kava root, instant kava, capsules and tinctures — sourced from Hawaii, Fiji, Vanuatu, and the Solomon Islands, with kavalactone content listed.
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