Kava Kava

Traditional Pacific Island ceremonial plant providing potent anxiolytic and relaxation support through unique kavalactone compounds

Scientific namePiper methysticum FormulaC14H14O3 (kawain) Molecular weight230.26 g/mol CAS500-64-1

75 absorption score

5 safety / 10

50 USD per month

5 documented interactions

Check it against something

Evidence level C

Kava Kava with:

75 out of 100

Works better together Compatible. Timing differs, so follow each supplement's own window.

Check it against your whole stack →

What it does

mechanism and evidence for each claim

Anxiety reduction and stress relief

Powerful anxiolytic effects reducing anxiety and stress

Kavalactones modulate GABA receptors providing potent calming effects Evidence B-grade 30-60 minutes acute, 2-6 weeks sustained

Deep relaxation and muscle tension relief

Promotes deep physical and mental relaxation

Muscle relaxant properties and nervous system calming effects Evidence B-grade 30-90 minutes acute

Sleep quality and insomnia support

Improves sleep quality and helps with sleep initiation

Sedative effects and anxiety reduction support better sleep Evidence B-grade 30-60 minutes before sleep

Social anxiety and performance anxiety relief

Reduces social anxiety and performance-related stress

Anxiolytic effects without cognitive impairment Evidence B-grade 30-60 minutes before stressful situations

Mood enhancement and well-being

Promotes positive mood and sense of well-being

GABAergic activity and stress reduction improve mood Evidence C-grade 30-90 minutes acute, 2-8 weeks sustained

Others take these for the same thing

Same goal, different mechanism — check any of them against this one

Melatonin Sleep support & circadian rhythm 0.5-3mg A 50% Ashwagandha Stress management & energy 300-600mg A 75% Magnesium Glycinate Superior absorption sleep & muscle support 200-600 mg A 90% L-Theanine Calm focus & stress relief 100-400mg B 90% Glycine Sleep quality & collagen support 3-10g A 95% GABA (Gamma-Aminobutyric Acid) Natural relaxation & anxiety relief 250-1000mg C 30%

Every pair we checked

12 combinations scored by the engine

Kava Kava + Caffeine May oppose relaxation and calming effects Needs attention 52

Kava Kava + Creatine Monohydrate No documented interaction either way No known interaction 70

Kava Kava + Vitamin D3 No documented interaction either way No known interaction 70

Kava Kava + Calcium Carbonate No documented interaction either way No known interaction 70

Kava Kava + Whey Protein No documented interaction either way No known interaction 70

Kava Kava + Lactase No documented interaction either way No known interaction 70

Kava Kava + Bovine Collagen No documented interaction either way No known interaction 70

Kava Kava + DHA No documented interaction either way No known interaction 70

Kava Kava + Turmeric No documented interaction either way No known interaction 70

Kava Kava + Fish Oil (EPA/DHA) No documented interaction either way No known interaction 70

Kava Kava + Magnesium Oxide Enhanced muscle relaxation and calming effects Works better together 75

Kava Kava + L-Theanine Comprehensive anxiety relief without sedation Works better together 75

Dosage

Evening as needed

Daily300-1200mg extract

Anxiety relief70-280mg kavalactones daily

Stress relaxation70-210mg kavalactones daily

Sleep support70-140mg kavalactones before bed

Social anxiety70-140mg kavalactones as needed

Before you take it

VeganYes

When to expect it

First Effects30-90 minutes for acute anxiety relief and relaxation

Peak Benefits2-8 weeks for sustained anxiety management and stress reduction

Deficiency DevelopmentNot applicable - herbal supplement

Toxicity OnsetRare, mainly with poor quality products or excessive use

How to measure it

$80-150

MarkerLiver function (ALT, AST, bilirubin), complete metabolic panel

OptimalNormal liver enzymes and function

Deficient belowNot applicable for herbal supplement

FrequencyEvery 1-3 months during use for liver monitoring

What people actually reported to the FDA

CAERS, 12 reports naming it as the suspect

Most reported effects

Death 2

Hepatitis acute 2

Fatigue 2

Pruritus 2

Rash 2

Named as the suspect 12 reports of 14 that mention it at all

Serious outcome 65% hospitalisation, emergency room or worse

Hospitalization4

Other Serious or Important Medical Event4

Other Outcome3

Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →

What actually reaches you

The label counts the carrier, your body does not

Absorption High 75 of 100 · absorbs well relative to other forms

Delivered daily 562.5 mg

Cost per 100 mg delivered $0.30 comparative — uses the absorption score, not a measured percentage

Works better with

3 documented

Magnesium

Enhanced muscle relaxation and calming effects

Both support muscle relaxation and nervous system calming · level C

L Theanine

Comprehensive anxiety relief without sedation

Complementary calming mechanisms for balanced relaxation · level C

Passionflower

Synergistic anxiety relief and sleep support

Both enhance GABAergic activity for anxiety reduction · level C

What not to take with Kava Kava

2 documented

Alcohol

Dangerous combination increasing liver toxicity risk

Both affect liver metabolism and CNS depression · high significance

Stimulants Caffeine

May oppose relaxation and calming effects

Opposing effects on nervous system arousal · moderate significance

Medication interactions

Discuss these with a pharmacist before combining

benzodiazepines-sedatives High

Dangerous enhancement of sedative effects

What to do: Avoid concurrent use

liver-metabolized-medications Moderate

May affect drug metabolism and liver function

What to do: Monitor liver function and drug levels

anticonvulsants Moderate

May interact with seizure medications

What to do: Monitor seizure control

Available forms

bioavailability compared

Kava Root Extract (Standardized 30% Kavalactones) 75

Kava Root Extract (Standardized 30% Kavalactones): Potent anxiolytic effects, Deep relaxation, No cognitive impairment, Traditional validation

Food sources

before you supplement

Fresh kava root Traditional preparation (highest kavalactones) · 80

Dried kava root powder Traditional ground root · 75

Kava tea Lower kavalactone extraction · 60

Standardized extracts Concentrated kavalactones (30%) · 75

Too little

deficiency signs

Not applicable (herbal supplement, not essential nutrient):
General symptoms addressed by kava kava:
Severe anxiety and panic symptoms
Chronic stress and tension
Difficulty relaxing and unwinding
Sleep difficulties due to anxiety
Social and performance anxiety

Too much

toxicity signs

Important safety considerations:
Liver enzyme elevation (rare but serious)
Significant drowsiness and sedation
Impaired motor coordination
Skin yellowing with very long-term use (reversible)

Who benefits most

anxiety-disorders-panic

Potent anxiolytic support for anxiety disorders and panic symptoms

70-280mg kavalactones daily (300-1200mg extract)

stress-tension-overwhelm

Deep relaxation and stress relief for chronic tension and overwhelm

70-210mg kavalactones daily

sleep-disorders-insomnia

Sleep support and relaxation for insomnia and sleep difficulties

70-140mg kavalactones 30-60 minutes before bed

social-performance-anxiety

Social and performance anxiety relief without cognitive impairment

70-140mg kavalactones as needed before stressful events

muscle-tension-pain

Muscle relaxation and tension relief for physical stress

70-210mg kavalactones daily

Where to buy it

compare forms first

Look for Kava Kava at 300-1200mg extract per serving. The form that matters here is Kava Root Extract (Standardized 30% Kavalactones).

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What else affects it

Beyond other supplements

Alcohol

Dangerous combination increasing liver toxicity risk

Both affect liver metabolism and CNS depression

How it works

Kavalactones modulate GABA-A receptors enhancing inhibitory neurotransmission
Blocks voltage-gated sodium channels reducing neuronal excitability
Muscle relaxant properties through effects on calcium channels
Modulates dopamine and serotonin systems affecting mood and anxiety
Inhibits norepinephrine reuptake reducing stress response
Direct anxiolytic effects without significant cognitive impairment

Key findings

what the evidence supports

Strong evidence for anxiety reduction and stress relief
Proven relaxation and sleep support benefits
Important liver safety considerations requiring quality products
Effective alternative to benzodiazepines for anxiety

Sources: NIH Examine.com · data reviewed 2026-08-02

Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →

Common questions

What are the benefits of Kava Kava?

Documented effects: Anxiety reduction and stress relief; Deep relaxation and muscle tension relief; Sleep quality and insomnia support; Social anxiety and performance anxiety relief. Powerful anxiolytic effects reducing anxiety and stress

How much Kava Kava should you take per day?

The common daily range is 300-1200mg extract. By goal — anxiety relief: 70-280mg kavalactones daily; stress relaxation: 70-210mg kavalactones daily; sleep support: 70-140mg kavalactones before bed; social anxiety: 70-140mg kavalactones as needed.

When is the best time to take Kava Kava?

Evening as needed. First effects are typically reported within 30-90 minutes for acute anxiety relief and relaxation.

What are the side effects of Kava Kava?

At excessive doses: Important safety considerations:, Liver enzyme elevation (rare but serious), Significant drowsiness and sedation, Impaired motor coordination, Skin yellowing with very long-term use (reversible). Safety rating at normal doses is 5 out of 10.

What should you not take with Kava Kava?

Separate it from Alcohol, Stimulants Caffeine by two to four hours. Dangerous combination increasing liver toxicity risk

Does Kava Kava interact with medications?

Documented interactions with benzodiazepines-sedatives, liver-metabolized-medications, anticonvulsants. Discuss these with a pharmacist before combining.

How do you know if you need Kava Kava?

The marker is Liver function (ALT, AST, bilirubin), complete metabolic panel, optimal range Normal liver enzymes and function. Common deficiency signs: Not applicable (herbal supplement, not essential nutrient):, General symptoms addressed by kava kava:, Severe anxiety and panic symptoms, Chronic stress and tension.

Taken for

28 Sleep & Stress

Melatonin · Magnesium Glycinate · Ashwagandha