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Piper methysticum
Kavalactones produce anxiolytic and muscle-relaxing effects comparable to prescription anti-anxiety medications in clinical trials.
What the evidence says
Kava helped in about half (4/7) of the studies that measured an effect — promising, but not unanimous.
Most evidence is from high-quality meta-analyses and randomised trials published 2003–2024 with a typical study size of 71 participants.
Based on 34 studies · 8 meta-analyses · 11 RCTs · 8,032 total participants
Confidence
HighWhat the studies found
By outcome
Kava has an evidence score of 9/10 — very strong evidence based on 34 indexed studies, including 9 meta-analyses. Kavalactones produce anxiolytic and muscle-relaxing effects comparable to prescription anti-anxiety medications in clinical trials.
The commonly studied dose of Kava is 150-300mg kavalactones daily. Research points to an estimated optimal dose around 240mg kavalactones, with a minimum effective dose near 120mg kavalactones. Individual response varies — start low and adjust.
The best time to take Kava is in the evening. It can be taken on an empty stomach. Kava (Piper methysticum) kavalactones act on GABA-A receptors, voltage-gated sodium and calcium channels, and MAO-B to produce anxiolytic, muscle-relaxant, and mild euphoric effects.
Last reviewed May 2026 · evidence from 37 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Kava is a traditional beverage from Pacific Island cultures made from the root of Piper methysticum. Its active compounds, kavalactones, produce anxiolytic, sedative, and muscle-relaxing effects. Clinical research supports its effectiveness for generalized anxiety disorder, with some studies showing comparable efficacy to prescription anxiolytics. However, concerns about liver toxicity (mostly linked to poor-quality products) require careful product selection.
Enhances GABA activity for calming effects
Reduces neuronal excitability
May mildly inhibit dopamine reuptake
How Kava works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
150-300mg kavalactones daily
Loading: Not applicable; can be used as needed or daily
Can be taken without food
| Form | Type |
|---|---|
| 💊Water-extracted root powder or capsules | Recommended |
| 💊Traditional kava drink | Alternative |
| 💊Standardized extract capsules | Alternative |
Use ONLY noble kava varieties from root (not aerial parts). Water or CO2 extraction is safest. Avoid alcohol-extracted products.
Minimum: 1 weeks
Optimal: 8 weeks
Cycling: Use for 4-8 weeks, then take 2-4 weeks off. Avoid continuous use for more than 3 months.
Note: Empty stomach increases absorption and effects. Do not combine with alcohol.
Based on multiple meta-analyses showing efficacy vs placebo with effect size comparable to benzodiazepines for mild-moderate anxiety. WS1490 extract showed OR=3.3 vs placebo. Effectiveness limited to 60% due to mixed results in some GAD populations and study quality limitations.
Noticeable calming without mental fog
Physical tension relief
Reduced social anxiety, more talkative
Drowsiness at higher doses
Avoid — Hepatotoxicity risk and unknown fetal developmental effects
Start with low doses; increased fall risk due to sedation
Never combine - significantly increases liver toxicity risk and sedation
Additive sedation - risk of excessive drowsiness
May reduce effectiveness of Parkinson's drugs
Additive liver stress - avoid combining
Excessive sedation, respiratory depression, liver toxicity risk
Excessive sedation, respiratory depression, liver damage
Excessive sedation, respiratory depression
Severe respiratory depression, coma risk
Excessive sedation, liver damage risk
Tip: Reduce dose; don't drive after use
Tip: Take with light food if needed
Tip: Only with very heavy, prolonged use - reversible when stopped
Kava should be used with caution — talk to a healthcare provider before taking it. The most commonly reported side effects are drowsiness, GI upset, kava dermopathy (scaly skin). Use caution if any of these apply to you: Liver disease or compromised liver function; Heavy alcohol use; Parkinson's disease (may worsen symptoms).
Valerian Root
Mostly mechanism / observationalGABA receptor agonist that improves sleep quality with 2-4 weeks of consistent use — best as part of a nightly routine.
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