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Kanna (Sceletium Tortuosum)
Kanna is a South African succulent plant traditionally used by the San and Khoikhoi peoples for its mood-elevating and anxiety-reducing effects. It contains mesembrine alkaloids that act as natural serotonin reuptake inhibitors and PDE4 inhibitors, offering rapid-onset mood support.
Benefits
What is Kanna (Sceletium Tortuosum)?
Kanna (Sceletium tortuosum) is a succulent plant native to South Africa with a documented history of use spanning over 300 years. The indigenous San (Bushman) and Khoikhoi peoples traditionally fermented and chewed the plant for its mood-elevating, anxiety-relieving, and appetite-suppressing properties - calling it "kougoed" (something to chew).
Modern pharmacological research has identified the primary active compounds as mesembrine-type alkaloids, which act as potent serotonin reuptake inhibitors (SRIs) and phosphodiesterase 4 (PDE4) inhibitors. This dual mechanism is unique among natural compounds and gives Kanna rapid-onset anxiolytic and mood-enhancing effects that many users describe as noticeable within 30–60 minutes.
The standardised extract Zembrin has been the subject of clinical trials demonstrating reduced anxiety, improved cognitive flexibility under stress, and modulation of the amygdala threat response - the brain's fear centre. An fMRI study showed that a single dose of Zembrin significantly reduced amygdala reactivity to fearful stimuli, providing objective neuroimaging evidence for its anxiolytic effects.
- Serotonin reuptake inhibition: Mesembrine potently inhibits the serotonin transporter (SERT), increasing serotonin availability at the synapse. This is the same primary mechanism as SSRI antidepressants, but through a natural alkaloid.
- PDE4 inhibition: Mesembrine and related alkaloids inhibit phosphodiesterase 4 (PDE4), increasing cyclic AMP levels. PDE4 inhibition has anti-inflammatory, neuroprotective, and cognition-enhancing effects.
- Amygdala modulation: Functional MRI studies show reduced amygdala reactivity to threat stimuli, explaining the rapid anxiolytic effect without sedation.
- VMAT2 interaction: Some evidence suggests interaction with vesicular monoamine transporter 2 (VMAT2), potentially influencing dopamine and norepinephrine packaging and release.
- Anti-inflammatory: PDE4 inhibition reduces pro-inflammatory cytokine production, potentially supporting neuroinflammation reduction.
- Standardised extract (Zembrin): 25 mg per day - the dose used in clinical trials
- Non-standardised extract: 50–200 mg per day, depending on alkaloid content and preparation method
- Traditional use: 50–100 mg of fermented plant material, chewed or brewed as tea
- Sublingual: Some users take Kanna sublingually for faster onset (10–20 minutes vs 30–60 minutes oral)
- Timing: Can be taken morning or as needed for anxiety. Effects typically last 4–6 hours.
Start with the lowest recommended dose. The Zembrin extract offers the most reliable, clinically validated dosing.
- Side effects: Generally well tolerated at recommended doses. Occasional reports of headache, nausea, and insomnia at higher doses.
- Serotonergic drugs - CAUTION: As an SRI, Kanna must NOT be combined with SSRIs, SNRIs, MAOIs, or other serotonergic drugs due to the risk of serotonin syndrome. Allow a washout period of at least 2 weeks when transitioning.
- MAOI interaction: Do not combine with MAO inhibitors - risk of hypertensive crisis and serotonin syndrome.
- Cardiac: High doses may cause elevated heart rate and blood pressure. Individuals with cardiovascular conditions should consult a doctor.
- Pregnancy: No safety data available - avoid during pregnancy and breastfeeding.
- Legal status: Legal in the UK, US, and most countries. Not a controlled substance.
Natural Sources & Forms
- Zembrin: Patented standardised extract of Sceletium tortuosum, used in clinical research. Standardised to mesembrine alkaloid content.
- Raw plant material: Dried and fermented Sceletium tortuosum available from specialist herbal suppliers
- Capsules and powders: Various extracts available with differing alkaloid concentrations
- Tinctures: Liquid extracts for sublingual use
- Tea: Dried plant material can be brewed, though traditionally it was chewed or snuffed
Frequently Asked Questions
Kanna is a South African succulent plant traditionally used by the San and Khoikhoi peoples for its mood-elevating and anxiety-reducing effects. It contains mesembrine alkaloids that act as natural serotonin reuptake inhibitors and PDE4 inhibitors, offering rapid-onset mood support.
The key benefits of Kanna (Sceletium Tortuosum) include: Anxiety & Calm, Cognitive Enhancement, Focus, Mood, Motivation, Stress Relief.
Serotonin reuptake inhibition: Mesembrine potently inhibits the serotonin transporter (SERT), increasing serotonin availability at the synapse. This is the same primary mechanism as SSRI antidepressants, but through a natural alkaloid. PDE4 inhibition: Mesembrine and related alkaloids inhibit phosphodiesterase 4 (PDE4), increasing cyclic AMP levels. PDE4 inhibition has anti-inflammatory, neuroprotective, and cognition-enhancing effects. Amygdala modulation: Functional MRI studies show reduced amygdala reactivity to threat stimuli, explaining the rapid anxiolytic effect without sedation. VMAT2 interaction: Some evidence suggests interaction with vesicular monoamine transporter 2 (VMAT2), potentially influencing dopamine and norepinephrine packaging and release. Anti-inflammatory: PDE4 inhibition reduces pro-inflammatory cytokine production, potentially supporting neuroinflammation reduction.
Standardised extract (Zembrin): 25 mg per day - the dose used in clinical trials Non-standardised extract: 50–200 mg per day, depending on alkaloid content and preparation method Traditional use: 50–100 mg of fermented plant material, chewed or brewed as tea Sublingual: Some users take Kanna sublingually for faster onset (10–20 minutes vs 30–60 minutes oral) Timing: Can be taken morning or as needed for anxiety. Effects typically last 4–6 hours. Start with the lowest recommended dose. The Zembrin extract offers the most reliable, clinically validated dosing.
Side effects: Generally well tolerated at recommended doses. Occasional reports of headache, nausea, and insomnia at higher doses. Serotonergic drugs - CAUTION: As an SRI, Kanna must NOT be combined with SSRIs, SNRIs, MAOIs, or other serotonergic drugs due to the risk of serotonin syndrome. Allow a washout period of at least 2 weeks when transitioning. MAOI interaction: Do not combine with MAO inhibitors - risk of hypertensive crisis and serotonin syndrome. Cardiac: High doses may cause elevated heart rate and blood pressure. Individuals with cardiovascular conditions should consult a doctor. Pregnancy: No safety data available - avoid during pregnancy and breastfeeding. Legal status: Legal in the UK, US, and most countries. Not a controlled substance.
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