Kava
Herb ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Kava root preparations have randomized-trial and systematic-review evidence for anxiety symptom reduction, but safety concerns include rare severe liver injury and additive sedation. Risk appears influenced by dose, duration, plant part, cultivar, extraction method, product quality, alcohol, and comedications. Kava should be avoided in liver disease, pregnancy, heavy alcohol use, and with sedatives unless clinician-supervised.
Exploratory record, not a reviewed medical publication.
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This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Kava is a herb most often used for may reduce anxiety symptom scores, may promote relaxation, may reduce muscle tension. NutriStack rates the overall evidence as moderate. A typical adult dose is 60-250 mg/day total kavalactones for short-term use in clinical anxiety studies; avoid prolonged or high-dose use, commonly taken as noble kava root-only aqueous or well-characterized extract with disclosed kavalactone dose. This profile indexes 3 sources.
The bottom line
Evidence rating moderate. Most-documented uses: may reduce anxiety symptom scores, may promote relaxation, may reduce muscle tension. 3 sources indexed (2003–2013), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Kavalactones such as kavain, dihydrokavain, methysticin, and yangonin modulate neuronal excitability through sodium and calcium channels, GABAergic tone, monoamine signaling, and limbic arousal pathways. These mechanisms can produce anxiolysis and muscle relaxation but also sedation and psychomotor impairment. Hepatotoxicity appears idiosyncratic or product-quality related in some cases, so conservative use and quality sourcing are essential.
Dosing & protocol.
Taking with food may reduce GI upset. Avoid alcohol and avoid products made from aerial parts or unclear extracts.
What it actually costs.
Real-world pricing across three quality tiers. Assumes Standardized kava root extract.
Quality-tested root-only products are preferred even if they cost more. Updated 2026-06-04.
Full safety detail.
Side effects
- Drowsiness
- Dizziness
- GI upset
- Headache
- Mouth numbness
- Dry scaly skin with heavy use
- Liver enzyme elevation or rare severe liver injury
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
1- 1Kava extract for treating anxietyPittler MH et al. · Cochrane Database of Systematic Reviews · 2003
Meta-analysis of controlled trials suggested anxiolytic benefit, with safety caveats.
Randomized controlled trials
1- 2Kava in the Treatment of Generalized Anxiety Disorder: A Double-Blind, Randomized, Placebo-Controlled StudySarris J et al. · Journal of Clinical Psychopharmacology · 2013
Kava was evaluated for GAD symptoms with liver function monitoring.
Reviews & position papers
1- 3Kava hepatotoxicity--a clinical reviewTeschke R et al. · Annals of Hepatology · 2010
Structured causality assessments identified probable and possible cases of kava-associated liver injury.
Common questions.
Quick answers about Kava, drawn from the data on this page.
What is Kava?
Kava root preparations have randomized-trial and systematic-review evidence for anxiety symptom reduction, but safety concerns include rare severe liver injury and additive sedation. Risk appears influenced by dose, duration, plant part, cultivar, extraction method, product quality, alcohol, and comedications. Kava should be avoided in liver disease, pregnancy, heavy alcohol use, and with sedatives unless clinician-supervised.
What is Kava used for?
Commonly cited benefits of Kava include: May reduce anxiety symptom scores; May promote relaxation; May reduce muscle tension; May support sleep when anxiety-related. NutriStack rates the overall evidence as moderate.
What is a typical dose of Kava?
A typical adult dose of Kava is 60-250 mg/day total kavalactones for short-term use in clinical anxiety studies; avoid prolonged or high-dose use. The commonly recommended form is Noble kava root-only aqueous or well-characterized extract with disclosed kavalactone dose. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Kava?
Reported side effects include drowsiness, dizziness, gi upset, headache, mouth numbness, dry scaly skin with heavy use. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Kava?
NutriStack rates this as Moderate, meaning several aligned RCTs or one large RCT plus supporting reviews. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
Kava in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.