Safety and Responsible Use
Kava has a long record of traditional use and a real, narrow set of cautions attached to it. We'd rather give you the accurate version than either the scare version or the sales version.
Don't mix with alcohol
Combining kava with alcohol is specifically discouraged. The combination may produce additive effects on coordination and motor performance and may increase safety risks. Pick one.
Don't drive
Research on kava and driving performance is mixed, particularly across different amounts and patterns of use. The practical rule is simpler: do not drive or operate machinery after a kava session.
Talk to your doctor about medications
Kavalactones interact with several enzyme systems involved in drug metabolism, although the clinical significance varies and is not completely established. If you take prescription medication — particularly sedating medications or medicines affected by liver metabolism — discuss kava with a physician or pharmacist first.
Not during pregnancy or breastfeeding
The American Herbal Products Association's Botanical Safety Handbook places kava in Safety Classes 2b and 2c: not for use during pregnancy or while breastfeeding. We also restrict our kava products to adults.
Liver conditions: Don't, without medical advice
If you have existing liver disease, a history of liver problems, frequently consume alcohol, or take medications that may affect the liver, do not use kava without talking to a healthcare professional first. Discontinue use and seek medical attention if you develop symptoms that could indicate liver problems.
Kava dermopathy
Heavy, sustained kava consumption can produce a dry, scaly skin condition known as kava dermopathy. It is well documented, minor and generally resolves after kava consumption is reduced or stopped.
In the early 2000s, a cluster of case reports in Europe associated kava-containing products with serious liver injury, leading several countries to restrict or ban kava. Those cases and the causality assessments behind them have been examined extensively in the two decades since.
The evidence today is considerably more nuanced than either “kava damages the liver” or “kava cannot damage the liver.” Serious liver injury associated with kava appears to be rare. Reviews have examined numerous possible contributors, including cultivar, plant part, extraction method, product quality, concurrent medications, alcohol use, dose, duration and individual susceptibility. None provides a complete explanation for every reported case.
The American Herbal Pharmacopoeia's 2025 Kava Rhizome and Root Monograph and Therapeutic Compendium, developed after a critical review of the available evidence, concludes that the hepatotoxicity reported in association with kava appears to be idiosyncratic rather than clearly dependent on dose, extraction solvent or duration of use. That means rare individual reactions cannot be completely eliminated by choosing a particular preparation method or product.
At the same time, traditional aqueous kava prepared from the appropriate underground portions of the plant has a long history of use and a substantially different exposure profile from concentrated extracts and poorly characterized products. Quality standards remain important because cultivar identity, plant part, contaminants, microbial quality and manufacturing practices are all variables that can be controlled even when rare individual reactions cannot be predicted.
Our approach is therefore not to claim that kava is risk-free. It is to control the variables we can control: appropriate plant material, beverage-grade cultivars, flavokavain limits, identity testing, contaminant testing and documented lot-level results. Our testing program is documented here.
-Tyler Blythe
Co-Founder
Root of Happiness
What Major Reviews and Regulators Say
Kava safety has been reviewed by international food-safety bodies, state regulators and independent botanical authorities. Their conclusions are not identical, but a consistent distinction appears throughout the record: traditionally prepared kava beverage is not the same exposure as every product marketed under the name kava.
WHO / FAO reviews: 2007 & 2016
In 2007, the World Health Organization published Assessment of the Risk of Hepatotoxicity with Kava Products, examining 93 case reports of liver injury that had been associated with Kava products. The review found no case in which the causal relationship with Kava was classified as certain, while also concluding that a potential for rare hepatotoxic reactions could not be excluded.
WHO returned to the subject with the Food and Agriculture Organization in 2016 in Kava: A Review of the Safety of Traditional and Recreational Beverage Consumption. That review focused specifically on Kava as traditionally prepared and consumed as a beverage in the South Pacific. It described a long history of consumption with little evidence of harm and characterized traditional preparation and consumption as presenting a low level of health risk.
Taken together, the two reviews illustrate an important distinction in the modern Kava safety record: reported liver-injury cases warranted investigation, while the safety record of traditionally prepared aqueous Kava beverage remained substantially more favorable.
Read the 2007 WHO assessment
Read the 2016 FAO/WHO technical review
German courts overturn the Kava withdrawal
Germany's restrictions on medicinal Kava products became one of the most influential consequences of the early liver-safety controversy. In 2014, the Cologne Administrative Court overturned the German regulator's withdrawal of Kava-containing medicinal products, and in 2015 the Higher Administrative Court of North Rhine-Westphalia rejected the regulator's appeal.
The appellate court found that the available evidence supported a suspicion of rare liver reactions but was not sufficiently consistent to justify the broad regulatory action that had been taken. It noted that the 2007 WHO review had classified none of its 93 cases as having a certain causal relationship with Kava and concluded that the available data suggested a very low incidence of hepatotoxic reactions.
The court also emphasized uncertainty in the underlying evidence, including differences in extraction methods, dosage, duration of use, concurrent medications, alcohol consumption and pre-existing liver conditions. The litigation concerned medicinal Kava preparations rather than the traditional aqueous beverage, but it remains an important reassessment of the evidence that originally drove European restrictions.
Hawai‘i and FDA: traditional ‘awa recognized as food
In January 2024, the Hawai‘i Department of Health, working with the University of Hawai‘i College of Tropical Agriculture and Human Resources, issued a formal determination recognizing Noble ‘awa root traditionally prepared with water or coconut water as Generally Recognized as Safe (GRAS) for that specific customary beverage use. The determination was based in part on the substantial history of traditional consumption of ‘awa by Native Hawaiians and applies narrowly to the traditional preparation rather than to every cultivar, plant part, extract or formulated Kava product.
The federal position became clearer later that year through correspondence between Hawai‘i Congressman Ed Case and the U.S. Food and Drug Administration. In a July 5, 2024 response to Representative Case, FDA stated that Kava prepared in the customary manner is considered a conventional food. FDA further explained that when Kava is steeped in water and consumed as a single-ingredient beverage, it generally is not regulated as a food additive and therefore does not require pre-market food-additive approval.
Read the Hawai‘i Department of Health determination
Read the FDA response to Congressman Ed Case
Michigan: Noble root and water considered GRAS
In 2023, the Michigan Department of Agriculture and Rural Development reached a similar conclusion. Based in part on the WHO technical review, MDARD considers Noble kava rhizome or root mixed with water as a conventional beverage to present a low risk to public health and to be Generally Recognized as Safe for that specific use.
The Michigan guidance specifically distinguishes that preparation from non-Noble kava and other preparations that fall outside the determination.
AHPA Botanical Safety Handbook
The American Herbal Products Association substantially updated the kava entry in its Botanical Safety Handbook in 2024, adding more than 45 recent references covering adverse-event reports, pharmacology, drug interactions and metabolism.
The Handbook recognizes kava's traditional use as a beverage and specifically discusses the different chemical profiles produced by traditional water extraction and contemporary organic-solvent extraction. It classifies kava as Safety Class 2b and 2c — indicating pregnancy and breastfeeding precautions — and Interaction Class B, meaning clinically relevant interactions are biologically plausible.
American Herbal Pharmacopoeia
The American Herbal Pharmacopoeia released its comprehensive Kava Rhizome and Root Monograph and Therapeutic Compendium in 2025 after years of work and international expert review. AHP revisited the liver controversy, including cultivar, plant part, extraction method, contaminants, genetics, dose and other proposed explanations.
After critically reviewing the evidence, AHP concludes that the rare hepatotoxicity associated with kava appears to be idiosyncratic and does not appear to follow a clear relationship with dose, extraction solvent or duration. That is an important distinction: the evidence supports a generally favorable safety record, but it does not justify claiming that adverse reactions are impossible.
The Hawai‘i and Michigan determinations should be read precisely. They are state regulatory determinations concerning a specific traditional use of Noble kava root or rhizome prepared with water. They are not blanket statements that every kava cultivar, extract, concentrate, supplement or formulated beverage is GRAS, and they should not be described as an FDA determination that all kava products are GRAS.
What Quality Control Has To Do With Safety
Quality control cannot eliminate every possible adverse reaction, particularly a rare idiosyncratic one. It can eliminate or reduce a number of avoidable variables.
The plant has to be correctly identified. The appropriate underground portions need to be used. Cultivar and beverage-grade status need to be established. Flavokavains need to remain within specification. Microbial contamination, mycotoxins, pesticides and heavy metals need to be controlled. Processing and storage need to preserve the material rather than introduce new problems.
Those are measurable questions. That is why we test lots individually rather than treating “kava” as though every cultivar, farm, harvest and product were interchangeable.
That is also the argument for buying kava from a company that publishes its testing and allows the customer to connect a lot number to actual analytical results rather than relying solely on the words “lab tested” on a package.
Kava Safety FAQ
The practical questions people ask most often about responsible kava use, interactions, liver safety, and who should avoid it.
No botanical or food is completely without risk, but traditionally prepared kava has a long history of use, and major reviews have generally characterized moderate consumption of appropriately prepared traditional kava beverage as presenting a relatively low level of health risk.
The 2016 FAO/WHO technical review specifically examined traditional and recreational kava beverage consumption and described traditional consumption as having a low level of health risk.
Safety depends on the individual, the kava material, the preparation, the amount consumed, other substances being used, and underlying health conditions.
Several major organizations have reviewed kava safety from different perspectives. The FAO/WHO reviewed traditional and recreational beverage consumption and characterized traditional use as presenting a low level of health risk. The World Health Organization separately reviewed reported hepatotoxicity associated with kava products in 2007.
Food Standards Australia New Zealand conducted a modern risk assessment while reviewing its kava food standard. The American Herbal Products Association substantially updated the kava entry in its Botanical Safety Handbook in 2024, and the American Herbal Pharmacopoeia released its comprehensive Kava Rhizome and Root Monograph and Therapeutic Compendium in 2025 after international expert review.
There are important state-level determinations, but they must be described precisely.
In 2024, the Hawai‘i Department of Health issued a GRAS determination for the traditional use of Noble ‘awa/kava root prepared with water or coconut water, based on the substantial history of traditional consumption. It applies to that defined preparation rather than every product sold as kava. Michigan's 2023 determination concerns the same specific traditional Noble-root-and-water preparation.
Neither should be represented as a blanket FDA determination that every kava extract, supplement, shot, or formulated beverage is GRAS.
The liver question is more complicated than either “kava damages the liver” or “kava cannot damage the liver.”
Rare cases of serious liver injury have been reported in association with kava-containing products, and those reports drove substantial regulatory concern beginning in the early 2000s; the WHO conducted a dedicated review of the hepatotoxicity reports in 2007. More recent reviews distinguish traditional aqueous kava beverage from the much broader range of extracts, supplements, plant materials, and formulations historically sold under the name kava.
The current evidence does not justify claiming that traditional kava is incapable of causing an adverse liver reaction. Serious reactions appear uncommon, and individual susceptibility may play an important role.
No. Quality control can reduce avoidable risks associated with incorrect plant material, inappropriate cultivars, contamination, microbial quality, poor drying, storage, adulteration, and manufacturing. It cannot guarantee that a rare individual adverse reaction will never occur.
The American Herbal Pharmacopoeia's 2025 kava monograph represents one of the most current comprehensive reviews of the botanical and revisits the long-running hepatotoxicity question.
We do not recommend combining kava with alcohol. Using them together may increase impairment and introduces an unnecessary variable when evaluating how either substance affects you.
People with heavy alcohol use or liver concerns should be particularly cautious and discuss kava use with a qualified healthcare professional.
Do not drive or operate machinery after drinking kava. Feeling mentally clear does not guarantee that coordination, reaction time, or motor performance are unaffected.
The practical safety rule is simple: if you have been drinking kava, arrange transportation rather than testing whether you personally feel impaired.
Potential interactions are possible. Kava and its constituents have been studied for effects on enzyme systems involved in drug metabolism, and additive effects may also occur with medications that affect alertness, coordination, or the central nervous system.
The AHPA Botanical Safety Handbook places kava in Interaction Class B, indicating that clinically relevant interactions are biologically plausible. If you use prescription medication, discuss kava with a physician or pharmacist who can evaluate the actual medication rather than relying on a generic internet interaction list.
Do not assume these combinations are safe. Medications that affect the central nervous system may have additive effects with kava, and some medications may also involve metabolic pathways affected by kava constituents.
Anyone taking psychiatric, sedating, sleep, seizure, or other centrally acting medication should discuss kava with the prescribing clinician or pharmacist before using it.
We do not recommend kava during pregnancy or breastfeeding. The American Herbal Products Association's Botanical Safety Handbook classifies kava in Safety Classes 2b and 2c, reflecting pregnancy and breastfeeding precautions.
Root of Happiness kava products are intended for adults.
Medical guidance is appropriate before using kava if you:
Have liver disease or a history of liver problems • Take prescription medication • Are pregnant or breastfeeding • Have a medical condition affected by sedating substances • Regularly consume large amounts of alcohol • Are preparing for surgery or a medical procedure • Have previously had an unusual reaction to kava
Kava dermopathy is a dry, scaly skin condition associated with sustained heavy kava consumption. It is well described in the literature and generally improves after kava consumption is reduced or stopped.
NCCIH also identifies dermopathy as a recognized effect associated with long-term high-dose kava use.
There is no universal consumption pattern that is appropriate for every person. Traditional kava cultures include a wide range of use patterns, from occasional ceremonial consumption to frequent social use.
Risk can change with the amount consumed, duration of use, individual health, medications, and the type of kava product. Daily use is not automatically safe simply because kava has a long traditional history — if you have any health condition or take medication, that conversation belongs with your doctor.
The available evidence does not show the same established dependence and withdrawal pattern associated with substances such as alcohol, benzodiazepines, or opioids, but problematic patterns of use can still occur with psychoactive substances.
Kava should not be described using absolute claims such as “kava cannot be addictive.”
No. Root of Happiness does not present kava as a treatment for anxiety, depression, PTSD, addiction, insomnia, or any other medical or mental-health condition.
Kava is a traditional botanical beverage whose place is in gathering, conversation, reflection, relaxation, and calm. It is not a substitute for professional medical or mental-health care.
No. Kava should not be marketed or used as a medical replacement for alcohol, recreational drugs, prescribed medication, addiction treatment, psychotherapy, or medically supervised withdrawal care.
Some adults choose kava as their beverage in social settings where other people may choose alcohol. That personal choice is different from claiming that kava treats alcohol dependence or replaces medical care.
Yes, and the distinction matters. Traditional kava beverage is generally prepared by working appropriate underground kava material in water and straining it. Modern products can include concentrated extracts, capsules, tinctures, shots, and other formulations produced using very different processes and concentrations.
Major reviews such as the FAO/WHO beverage review specifically evaluated traditional and recreational kava beverage consumption rather than treating every kava-containing product as the same exposure. This distinction does not mean traditional kava is incapable of causing adverse effects.
Yes. Traditional beverage kava is made from appropriate underground portions of the plant. Leaves and upper aerial stems are not part of traditional beverage preparation and are excluded from the raw-material specifications Root of Happiness uses for its kava products.
Yes, but Beverage Grade should not be confused with a guarantee that an adverse reaction is impossible. Cultivar identity, plant material, chemotype, flavokavain content, processing, and testing all contribute to determining whether a lot is appropriate for beverage use.
Those controls eliminate or reduce avoidable quality problems. They do not remove individual biological variability.
Stop using the product. Seek appropriate medical attention for significant or persistent symptoms, particularly symptoms involving severe weakness, vomiting, confusion, jaundice, dark urine, significant abdominal pain, difficulty breathing, loss of consciousness, or another serious reaction.
Important
This guide is provided for educational purposes and reflects traditional use, published research, and our own experience sourcing, testing, manufacturing and serving kava since 2006. It is not medical advice and is not a substitute for consultation with a qualified healthcare professional.
These statements have not been evaluated by the Food and Drug Administration. Kava products are not intended to diagnose, treat, cure, or prevent any disease. Kava is for adults only. Do not use if pregnant or breastfeeding. Do not combine with alcohol. Do not drive or operate machinery after consuming kava. Consult a physician before use if you have or have had liver problems, frequently use alcoholic beverages, or take any medication. Discontinue use and consult a physician if you experience symptoms that may signal liver problems, including jaundice, unusual fatigue, abdominal pain, loss of appetite, or dark urine.