For most people, the name "kava" refers to both the plant known by botanists as Piper methysticum ("intoxicating pepper") and the traditional beverage made from its rootstock. We use the word for both. Below are the essential facts about the plant and the drink that anyone interested in consuming kava should understand.

On this page:
1. About Kava
2. The Kava Plant
3. The Beverage and Its Effects
4. Kava Chemotypes
5. Kava's Potency

For more detail beyond the basics, see our FAQ or get in touch.

Kava is one of humanity's oldest cultivated plants, used across the Pacific for over 3,000 years. It's both a plant and a drink: the rootstock of Piper methysticum is ground (or pounded), mixed with cold water, and consumed as a calming, social beverage. Pacific Island cultures have built ceremonies, conversations, and daily life around it. In Vanuatu it's still consumed every evening in nakamals, the traditional kava bars, just as it has been for centuries.

The story of kava is a story of careful selection. Today's noble cultivars are the result of generations of growers picking the most desirable mutations from a sterile plant that can only reproduce by stem cutting. The plant's character (taste, aroma, effects) varies meaningfully between cultivars, regions, and processing methods, which is what makes kava interesting to learn about.

Kava (Piper methysticum) belongs to the pepper family Piperaceae, related to the black pepper in your kitchen. According to research by Dr Vincent Lebot, kava was domesticated in northern Vanuatu around 3,000 years ago from a wild species called Piper wichmannii. Farmers encountered a unique mutation that produced much more pleasant effects than the wild plant. The new variety was sterile and harder to grow, requiring human intervention to reproduce through stem cuttings, but its superior properties made the extra effort worthwhile. Over centuries, traditional farmers carefully selected and preserved the most desirable mutations, leading to today's noble kava cultivars. From Vanuatu, these cultivars gradually spread across the Pacific.

You can read more about this historical selection process and how it produced better kava over time in our cultivar selection deep-dive, and explore our own single cultivar range.

Which parts are used? When mature, kava grows into an attractive shrub that can reach over three metres in height. Its most valuable parts are underground: the roots and rootstock, which develop into a substantial mass through traditional farming techniques like soil mounding. The plant's large, heart-shaped leaves are essential for growth, but it's the roots that contain the compounds prized by traditional drinkers. Aerial parts (leaves and stems) contain a potentially toxic alkaloid (pipermethystine) and have never been traditionally consumed. See Kava's Purity and Quality for why this matters when you're buying kava.

As V. Lebot and J. Lèvesque write:

The remarkable medicinal properties and soothing effects of kava have been part of the wisdom of Pacific islanders for centuries. Melanesians, Polynesians and Micronesian people alike grind the fresh or dry roots of this plant to prepare their traditional beverage, which is the centerpiece for much solemn ritual as well as being the daily social drink for many appreciative Oceanians.

The specific effects of kava depend on the cultivar, the plant's potency and the method of consumption. Generally speaking, kava is known as a relaxing drink with the potential to promote sociability and a sense of peace and harmony, without diminishing mental awareness or clarity. For many people, kava is a pleasant, refreshing and mentally uplifting drink that relieves fatigue, relaxes the body after hard work, clears the mind, and brings a sense of well-being.

Kava has been an important component of traditional Pacific medicine, and its calming properties remain a subject of ongoing scientific research. That said, most people consume it today as a traditional, relaxing and refreshing beverage, not as a remedy. That's how we see, consume and promote it.

One useful comparison is coffee. Both kava and coffee are social drinks. Coffee gives a mild buzz and a kick of energy; kava is known as a gentle relaxing tonic. Read more on kava and alcohol, kava and caffeine, or kava and sleep.

The main active ingredients in kava responsible for its effects are known as kavalactones, concentrated in the rootstock and roots. Different cultivars naturally display distinct compositions and concentrations of these compounds. For a deeper read on this fascinating topic, see our chemotype deep-dive.

A kava's chemotype is expressed as a six-digit number that lists the relative amounts of major kavalactones in decreasing order. While this code alone can't perfectly predict effects (the full picture involves complex interactions between compounds), it provides valuable guidance about what to expect from different varieties.

For instance, kavas with higher proportions of kavain (identified by number 4 in first or second position) tend to produce more "heady", uplifting effects, ideal for daytime use and social occasions. Those with higher concentrations of compounds like dihydromethysticin (number 5) typically offer more sedating, "heavy" effects better suited for evening relaxation. You can learn more in our guide to types and forms of kava.

Kavas vary not just in chemotype and taste but in strength. The most reliable indicator of kava's potency is its kavalactone content, which in properly harvested roots should be between 5% and 15%. Anything below 5% suggests poor quality or poor storage. This measurement serves as a useful guide when choosing kava and determining serving sizes. See our guide on the right amount of kava for serving guidance.

Experienced kava drinkers often notice that subjective potency doesn't always correlate directly with kavalactone percentage. As Dr Vincent Lebot's research shows, fresh kava contains numerous compounds beyond kavalactones (acidic, volatile, and enzymatic elements) that are typically lost during standard drying processes. This helps explain why freshly harvested green kava in Vanuatu can feel more potent and offer a richer experience than dried kava with similar kavalactone content. Quality processing is what preserves these compounds. See Why Choose Our Kava for our approach.

Whether dealing with fresh or dried kava, several key factors determine fundamental strength and quality:

• Plant age. Kava reaches its peak kavalactone content within 18 to 36 months of planting. Beyond that age it doesn't get stronger, but good farmers often keep it in the ground longer to increase root mass. Plants harvested too early produce weak kava.
• Cultivar. Different varieties naturally tend toward different strength levels, though farming and processing usually have more impact on final potency.
• Farmer's expertise. Experienced farmers know exactly how to cultivate and harvest kava for optimal quality: traditional farming techniques, clean and well-tended gardens, careful separation of root types during harvest, proper cleaning, knowing the optimal harvest time for each cultivar.
• Root composition. Lateral roots (the thin roots spreading from the main rootstock) are the most potent part. Powders with higher proportions of laterals are more expensive and more potent. Note that with extra strength comes extra flavour: the stump has a much milder taste than lateral roots.
• Storage conditions. Kava can lose potency rapidly if not stored properly. Vacuum-sealing is best as it prevents oxidation; failing that, use air-tight containers and store in a cool, dry place away from sunlight. Even well-stored kava gradually loses potency.

For the deeper read on what affects kava's purity and quality across the industry, see Kava's Purity and Quality.