Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Kavalactones

PhytochemicalLactoneBest before bed

Useful mainly for short-term relief of situational or generalized anxiety.

Quick decision guide

May help most

short-term relief of situational or generalized anxiety

Common dosing range

60–300 mg kavalactones/day

When to expect effects

Hours to days

Watch out for

risk of liver injury; avoid with alcohol, liver disease, or other hepatotoxic drugs

What is it

Kavalactones are a group of lactone compounds found in the root of kava (Piper methysticum), the active ingredients responsible for its anxiolytic and sedative effects. There are six major kavalactones, including kavain, dihydrokavain, and methysticin.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

you need short-term anxiety relief and have healthy liver function
you can use a water-extracted root product for a limited period
you avoid alcohol and other sedatives while using it

Probably skip if…

you have liver disease or drink alcohol regularly
you take benzodiazepines or other CNS depressants
you need a daily long-term anxiety treatment

Evidence at a glance

anxiety (short-term)

Good Evidence
Effect
Moderate reduction in anxiety scores
Best fit
adults with generalized or situational anxiety and healthy livers
Time
Hours to days

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

anxiety (short-term)

Supplement benefit
Good Evidence

Meta-analyses of randomized controlled trials show kava standardized to kavalactone content reduces anxiety symptoms versus placebo over short-term use. Kavalactones modulate GABA-A signaling and produce calming effects without major cognitive impairment at moderate doses. The main limitation is hepatotoxicity risk, which has driven regulatory restrictions in some countries.

Effect size
Moderate reduction in anxiety scores
Time to effect
Hours to days
Best fit
adults with generalized or situational anxiety and healthy livers

Bottom line: Among the better-evidenced herbal anxiolytics for short-term use, but liver safety governs how it should be used.

SourcePittler et al., 2000 — PubMedPittler et al., 2003 — PMC

How it works

Kavalactones modulate GABA-A receptors (a primary inhibitory neurotransmitter system), affect dopamine and serotonin signaling, and may inhibit norepinephrine reuptake. They appear to produce calming and mild sedative effects without significant cognitive impairment in moderate doses. Clinical evidence supports kava (standardized to kavalactone content) for short-term anxiety relief. The herb has been controversial due to reports of hepatotoxicity, primarily linked to certain extraction methods and product types.

How to take it

1. Typical dose
60–300 mg kavalactones/day
2. Timing
30–60 minutes before a stressful situation or bedtime
3. With food
with water; avoid alcohol the same day
4. Split dosing
often divided into 2–3 doses for daily use
5. How long to try
limit to short courses; do not exceed labeled duration

What to track

anxiety level
daytime drowsiness
signs of liver problems (jaundice, dark urine, abdominal pain)

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Standardized kava extract

Provides consistent kavalactone dosing. Traditional water extraction may be safer than acetone or alcohol-based methods.

Water or aqueous-ethanol extracts of the root; standardized to kavalactone content.

Traditional kava beverage

Variable kavalactone content depending on preparation.

Water-extracted root, traditionally consumed in Pacific cultures.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

GI upsetdrowsinessskin reactions (kava dermopathy with chronic use)

Serious risks

  • hepatotoxicity, including rare severe liver injury

Who should avoid it

  • people with liver disease
  • regular alcohol users
  • pregnant or breastfeeding people
  • people taking benzodiazepines or other sedatives

Pregnancy & breastfeeding

Avoid in pregnancy and breastfeeding.

Interactions

alcoholMajor

additive sedation and liver stress

benzodiazepines and CNS depressantsMajor

additive sedation

hepatotoxic drugs (high-dose acetaminophen, methotrexate, some statins)Major

compounded liver injury risk

levodopaModerate

may reduce levodopa effect

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

standardized kavalactone content
traditional water-extracted root (not stems/leaves)
noble kava cultivar

Be skeptical of…

safe for unlimited daily use
no liver risk
treats depression or panic disorder

Frequently asked questions

Is kava safe for the liver?⌄

Risk of liver toxicity exists but is uncommon with appropriate use of root-only, water-extracted products in healthy people without other liver stressors. Avoid combining with alcohol or other hepatotoxic substances.

Can I take kava every day?⌄

Long-term daily use is generally not recommended due to potential for liver effects and kava dermopathy. Short-term, episodic use (a few weeks) is the typical pattern in clinical studies.

References by claim

anxiety (short-term)

Pittler et al., 2000 — PubMed (2000) link

Pittler et al., 2003 — PMC (2003) link

Track Kavalactones with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store
Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.