Kanna vs Kava: Different Plants, Different Effects

TL;DR: Kanna is a South African succulent whose alkaloids act on serotonin; kava is a Pacific pepper root whose kavalactones act on GABA. Kanna is measured in milligrams of extract and people describe it as a lift with the edge taken off. Kava is measured in grams of root and people describe it as heavy, body-first calm with a numb tongue. We sell both and pour both at our bar, and the honest advice is that they are for different moments, not competing for the same one.

People walk into Roots Kava Bar and ask for "the calm one," and the bartender has to ask a follow-up question, because we have two very different plants behind the counter that both fit that description. This is the comparison we give at the bar, with the numbers.

Two plants, two continents

Kanna grows low to the ground in the dry Karoo region of South Africa. It is a succulent, a few inches tall, and the whole plant is used. The Khoisan chewed it and fermented it for centuries. Its active compounds are mesembrine-type alkaloids: mesembrine, mesembrenone, mesembrenol and a few minor ones.

Kava is a shrub in the pepper family from Vanuatu, Fiji, Tonga and neighboring islands. Only the root is used. It is ground, kneaded in cold water and strained into a communal bowl. Its active compounds are kavalactones, a group of about 18, with six of them doing most of the work.

Different plant families, different parts of the plant, different chemistry. The only thing they share is a reputation for taking the edge off.

Side by side

	Kanna	Kava
Plant	Small succulent, South Africa	Pepper-family shrub, South Pacific
Part used	Whole plant, often fermented	Root only
Active compounds	Mesembrine-type alkaloids	Kavalactones
Main target	Serotonin transporter, PDE4	GABA system
Typical amount	25 to 150 mg of extract	2 to 5 g of instant or 20 to 40 g of medium grind
Onset	15 to 30 min oral, faster sublingual or nasal	20 to 30 min
Duration people report	2 to 4 hours	2 to 3 hours, heavier tail
Feel people describe	Lifted, social, clear, calm underneath	Heavy, relaxed, numb mouth, sedating at higher amounts
Taste	Bitter, earthy	Earthy, peppery, muddy
Tolerance pattern	Builds with daily use, resets with breaks	Reverse tolerance, often stronger after a week
Alcohol	No study; guests report it cancels out	Should not be combined

How each one works

Kanna's main alkaloid, mesembrine, is a serotonin reuptake inhibitor, and the whole extract also inhibits an enzyme called PDE4. A 2013 fMRI study gave 16 healthy adults a single 25 mg dose of a standardized extract and saw the amygdala react less to fearful faces. That is a mood and stress circuit, which is why the experience is more about how you relate to a room than how heavy your limbs feel.

Kava's kavalactones work on GABA, the brain's main inhibitory signal, partly by changing the lipid membranes and sodium channels that neurons use. A 2026 narrative review of the clinical trials notes that most studies used 120 to 240 mg of kavalactones per day, while a traditional ceremonial session can run into the thousands of milligrams. GABA is a body system as much as a head system, so kava lands in the shoulders, the jaw and the legs.

What people say each one feels like

The reports we hear at the bar are consistent enough to summarize.

Kanna: "I feel like myself but less in my head." Conversation gets easier. Music sounds better. There is energy in it, especially with a mesembrine-forward extract, and a calm floor underneath. At higher amounts some people get a stomach or a head rush they do not enjoy.

Kava: "My tongue went numb and then my whole body sat down." The first shell often feels like nothing. By the third the shoulders drop. It is quiet, not chatty, and at higher amounts it is a couch, not a dance floor.

Both are alcohol-free and both leave most people clear the next morning. That is the overlap. Everything else is different.

Dosing is a different scale

This trips up new customers. Kanna extract is measured in milligrams. A 5 percent extract like our MT5 Bloom is used at roughly 50 to 150 mg, which is a micro scoop, not a spoon. Kava is measured in grams. A shell of instant kava is 2 to 3 g and a traditional medium-grind prep uses 20 to 40 g of root per session.

If you treat kanna like kava and scoop a gram, you will have a bad night. If you treat kava like kanna and use 100 mg, you will feel nothing at all.

Which one for which moment

• Going out, want to talk to people: kanna. A mesembrine extract or a couple of sprays.
• Home, want to stop thinking: kava. A heavy body strain, two or three shells.
• Replacing a beer after work: either works. Kava is the closer feel to a drink for most people.
• Daytime, need to get things done: kanna, low amount. Kava will slow you down.
• Trouble winding down at night: kava, or a mesembrenone-heavy kanna.

Plenty of our regulars use both, kanna earlier and kava later, and some combine them in one drink. That combination has its own post. Start with each alone first so you know what each one does.

Safety notes that differ

Kanna is serotonergic. If you take an SSRI, SNRI, MAOI or other serotonin-active medication, talk to your doctor before using it. The kava question people ask most is the liver. The same review summarizes the WHO finding that traditional water-based kava preparations have limited documented liver toxicity, and that the concern rises with solvent extracts, unusual dosing and combining with other drugs. Kava should never be mixed with alcohol. Neither plant is for pregnancy or nursing.

Where to start

If you have never tried either, pick one, not both. Our kanna extracts come in quarter-gram jars so you can test a profile for a few dollars, and the kava collection has 7 g trial packs of instant kava, which is three to five shells. Two sessions with each and you will know which plant is yours.

Keep reading: Kanna vs Kratom: What's the Difference? and Day Kava vs Night Kava.

Disclaimer. For adults 21 and over. Kava should not be combined with alcohol. Do not use kava if you are pregnant or nursing, or if you have concerns about your liver; talk to a qualified professional first. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Traditional use of a botanical does not establish that it will produce any particular result. Keep out of reach of children.