This article is for general information only and is not medical advice. Kava can interact with alcohol, medicines, and health conditions. Speak with a qualified health professional if you are unsure whether kava is appropriate for you.
Kava is a drink made from the root of a plant called Piper methysticum. The plant grows in the South Pacific, especially in places like Vanuatu, Fiji, Tonga, Samoa, and Hawaii. It belongs to the pepper family, but people do not use it like black pepper. They use the root to make a calming drink.1
Kava is not new. It has been used for a very long time in Pacific Island cultures. In many places, it is more than just a drink. It is part of ceremonies, village meetings, welcomes, peace-making, and social life. In the West, people often use it in a different way. They take it to relax, reduce stress, help with sleep, or replace alcohol.1
The simplest way to describe kava is this: Kava is a traditional South Pacific root drink that can make people feel calm, relaxed, and a little sleepy. But there is more to it than that.
What is kava made from?
Kava is made from the root and underground stem, also called the rhizome, of the kava plant.1
Traditional kava is usually made by grinding or pounding the root, mixing it with water, and straining it. The drink often looks muddy or cloudy. It has an earthy taste. Some people say it tastes peppery, bitter, or woody. A strong kava drink can also make your mouth and tongue feel numb.
That numb feeling is one sign that the kava is active.
Good traditional kava is usually made from the right parts of the plant: the root and rhizome. It should not be made from leaves or random stems. International food standards for kava products focus on kava made from selected parts of noble kava varieties and mixed with water for use as a drink.2
This matters because not all kava products are equal. A traditional water-based kava drink is not the same thing as a strong extract in a capsule, tincture, shot, or commercial “relaxation drink.”
Why do people drink kava?
People drink kava for several reasons. Some drink it because it is part of their culture. Some drink it with friends. Some use it as a way to unwind at the end of the day. Others use it because they want something relaxing but do not want alcohol.
The common reasons are to feel calm, reduce stress, feel more social, relax the body, help with sleep, or avoid and reduce alcohol use.
Kava is often described as giving a “clear calm.” That means some people feel relaxed but not drunk in the same way alcohol makes them drunk. Still, kava can affect the brain and body. It can slow reaction time, make you sleepy, and affect balance or coordination.
So it should not be treated like harmless tea.
How does kava work?
Kava contains natural compounds called kavalactones. These are the main active chemicals in the plant.1
Kavalactones affect the nervous system. The nervous system is the body’s control center. It includes the brain, spinal cord, and nerves. When kava works, it can make the nervous system feel less “switched on.” This is why many people feel calmer after drinking it.
Kava is often described as a central nervous system depressant. That sounds dramatic, but it simply means it can slow down activity in the brain and body.5
Alcohol is also a central nervous system depressant. So are sleeping pills and some anxiety medicines. Kava is not the same as those substances, but it can overlap with them in effect. This is why mixing kava with alcohol, sleeping pills, opioids, benzodiazepines, or other sedating substances can be risky.1
What does kava feel like?
The effects depend on the person, the strength of the kava, the amount taken, and the type of product.
A mild serving may feel like less tension, a calmer mood, a relaxed body, and a little more ease in conversation.
A stronger serving may feel like heavy limbs, sleepiness, slower thinking, dizziness, poor coordination, or nausea.
Some people love the feeling. Others dislike the taste or feel strange on it.
Kava is not usually described as a wild, psychedelic, or highly emotional drug. It is more often described as grounding, quieting, and body-relaxing. But if someone takes too much, it can become unpleasant.
Is kava like alcohol?
Kava and alcohol can both relax people, but they are not the same.
Alcohol often lowers inhibition, clouds judgment, and can make people loud, emotional, reckless, or aggressive. Kava is usually seen as calmer and less chaotic. In many traditional settings, kava is used in slow, respectful, social ways.
But that does not mean kava is risk-free.
Kava can still impair you. It can make you sleepy. It can slow reaction time. It can make driving dangerous, especially when mixed with alcohol or other sedatives.1
A good rule is simple: Do not drive, swim, operate tools, work at height, or do emergency work after using strong kava.
Does kava help with anxiety?
Kava may help some people with anxiety, but the evidence is not perfect.
A Cochrane review found that kava extract may be better than placebo for symptoms of anxiety. But the effect seemed small, and the researchers said larger and better long-term safety studies were needed.3
The National Center for Complementary and Integrative Health says kava supplements may help with anxiety, but there is not enough strong evidence to say it helps many other conditions. It also notes that kava does not appear helpful for symptoms of generalized anxiety disorder.1
So the honest answer is: Kava may help some people feel less anxious, but it is not a guaranteed anxiety treatment.
If someone has serious anxiety, panic attacks, depression, trauma, or addiction issues, kava should not be used as a replacement for proper medical or psychological help.
Is kava safe?
This is where the story gets more serious.
Kava has been linked to rare but serious cases of liver injury. In some reports, people developed hepatitis, liver failure, or needed liver transplants.4
This is the biggest safety concern around kava.
The debate is complicated. Some experts believe the worst cases may have involved poor-quality products, strong extracts, wrong plant parts, alcohol or acetone extracts, other medications, heavy use, or people who were already vulnerable. But the risk cannot be ignored.
The U.S. Food and Drug Administration issued a consumer advisory in 2002 warning that kava-containing dietary supplements may be linked to severe liver injury.4
This does not mean everyone who drinks kava will damage their liver. Many people use traditional kava without obvious harm. But it does mean kava deserves respect.
You should be especially careful if you have liver disease, have fatty liver, drink alcohol often, take prescription medicines, use sleeping pills or anxiety medication, use opioids, use kratom, are pregnant or breastfeeding, or use kava daily or heavily.
If you use kava often, it is sensible to speak with a doctor and consider liver blood tests.
Warning signs to watch for
Stop using kava and get medical advice if you notice signs that may point to liver trouble. These include yellow skin or yellow eyes, dark urine, pale stools, ongoing nausea, loss of appetite, unusual tiredness, itchy skin, or pain in the upper right side of the belly.
Do not try to “push through” these symptoms.
Kava and kratom: a modern problem
Traditional kava is one thing. Modern commercial drinks are another.
Some products now combine kava and kratom. Kratom is a different plant with opioid-like effects. This combination is not the same as traditional kava drinking.
The CDC reported growing concern about kava-related poison center reports in the United States, especially where kava products are combined with kratom or sold as high-strength commercial drinks.5
This is important because many people see “plant-based” and assume “safe.” That is bad thinking. Plants can be powerful. Some can help. Some can harm. Some can do both.
A kava drink made from noble root and water is very different from a strong canned product with kava extract, kratom, caffeine, sweeteners, and unclear dosing.
My plain advice: avoid kava products that contain kratom.
What is noble kava?
You may see the phrase noble kava when buying kava.
“Noble” kava usually means a variety of kava that is traditionally preferred for regular drinking. It is often contrasted with “Tudei” or “two-day” kava, which may have stronger or longer-lasting effects and is usually not preferred for everyday use.
International kava standards for beverage products focus on noble kava varieties and proper plant parts.2
A good kava product should ideally tell you the country of origin, whether it is noble kava, the plant part used, the kavalactone content, whether it is root-only, and whether it has been tested for contaminants.
A vague label is a bad sign. If a product only says “ancient relaxation blend” or “proprietary kava extract,” that is not enough information.
What forms does kava come in?
Kava can be sold in many forms.
The most traditional form is powdered root mixed with water. But today, kava is also sold as dried root powder, instant kava powder, capsules, tablets, liquid extracts, tinctures, ready-to-drink cans, kava shots, kava tea bags, and kava mixed with other herbs or drugs.
These forms may not have the same strength or safety profile.
A water-prepared root drink is closer to traditional use. A strong extract may be much more concentrated. A mixed product may include other substances that change the effect and risk.
When it comes to kava, the form matters.
Can kava be addictive?
Kava is not usually considered addictive in the same way as alcohol, nicotine, opioids, or benzodiazepines. But that does not mean nobody can overuse it.
People can build habits around anything that changes how they feel. If someone starts needing kava every night to relax, sleep, or escape stress, that is worth looking at honestly.
A useful question is: Am I using kava, or am I relying on it?
There is a difference.
Using kava now and then for relaxation is one thing. Needing it every night to cope is another. That does not mean panic. It means pay attention.
Who should avoid kava?
Some people should avoid kava or speak to a medical professional before using it.
This includes people who have liver problems, drink alcohol heavily, take sedatives or sleeping pills, take anxiety medicines such as benzodiazepines, take opioids, take several prescription medicines, are pregnant, are breastfeeding, need to drive or work safely afterward, or have had bad reactions to herbal supplements before.
Kava should also be avoided before driving, firefighting, operating machinery, using power tools, swimming, or sitting in very hot water for long periods.
Relaxation is good. Passing out, falling, or making a bad safety decision is not.
How to use kava more safely
No psychoactive substance is completely risk-free. But some choices are smarter than others.
A safer approach is to choose a reputable supplier, use noble kava, use root or rhizome only, avoid mystery blends, avoid kratom mixtures, avoid alcohol, and avoid using it before anything risky.
It is also wise to start low. Do not take a large serving just because someone online says they do. Different people respond differently.
Also, watch how often you use it. If it becomes a nightly necessity, take that seriously. Your body and mind may be telling you something.
The deeper appeal of kava
Part of what makes kava interesting is that it sits between worlds.
It is a plant, but not just a plant. It is a drink, but not just a drink. It is calming, but not harmless. It is ancient, but now it is being sold in modern cans and capsules.
In its traditional setting, kava can be slow, social, respectful, and ceremonial. In the modern supplement market, it can become just another product promising instant calm.
That difference matters.
Kava is best understood with respect. It has a real history. It has real effects. It has real risks.
Footnotes and sources
1 National Center for Complementary and Integrative Health, “Kava: Usefulness and Safety.” https://www.nccih.nih.gov/health/kava
2 Codex Alimentarius / FAO-WHO, “Regional Standard for Kava Products for Use as a Beverage When Mixed with Water, CXS 336R-2020.” https://www.fao.org/fao-who-codexalimentarius/
3 Cochrane, “Kava Extract for Treating Anxiety.” https://www.cochrane.org/evidence/CD003383_kava-extract-treating-anxiety
4 NIH Office of Dietary Supplements, “Kava.” https://ods.od.nih.gov/HealthInformation/kava.aspx
5 CDC Morbidity and Mortality Weekly Report, “Increase in Poison Center Reports Linked to Kratom-Containing Kava Products.” https://www.cdc.gov/mmwr/volumes/75/wr/mm7512a1.htm