Hermetica Superfood Encyclopedia
The Short Answer
Kanna (Sceletium tortuosum) is a South African succulent containing mesembrine alkaloids that inhibit serotonin reuptake and phosphodiesterase-4. Research shows potential anxiolytic and mood-enhancing effects, though human clinical trials remain limited.
CategoryHerbs (Global Traditional)
GroupAfrican
Evidence LevelModerate
Primary Keywordkanna benefits
Synergy Pairings3
Kanna (Sceletium tortuosum) — botanical close-up
Health Benefits
Origin & History
Natural habitat
Kanna (Sceletium tortuosum) is a succulent plant native to South Africa from the Mesembryanthemaceae family, traditionally known as kanna or kougoed. The active compounds are extracted from leaves and stems using acid/base methods, methanol extraction, or HPLC purification, with primary bioactives being indole alkaloids including mesembrine, mesembrenone, and mesembrenol.
“Sceletium tortuosum has been used for centuries in South African indigenous medicine as a mood-elevating plant, often chewed dried or fermented to treat stress, anxiety, and suppress hunger. Historical phytochemical studies date back to 1898, with traditional practices including regular chewing (frequency self-limited by mild hypnotic effects), teas, and decoctions.”Traditional Medicine
Scientific Research
The research dossier reveals no human clinical trials, RCTs, or meta-analyses have been conducted on Kanna. Available evidence consists solely of preclinical reviews examining biological properties in vitro and animal models, with one referenced abstract mentioning acute effects in rats but providing no human trial data.
Preparation & Dosage
Traditional preparation
Traditional monograph suggests 50-200 mg of dried, powdered herb (equivalent to 1-4 mg alkaloids) in tablets or capsules, taken 2-3 times daily. Traditionally chewed dried throughout the day, or prepared as teas, decoctions, or tinctures without quantified dosages. No standardized clinical dosing established. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
Kanna (Sceletium tortuosum) is a succulent plant used primarily for its psychoactive and medicinal alkaloid content rather than as a macronutrient source. Macronutrient contribution is nutritionally negligible at typical supplemental doses (25–100mg extract). Primary bioactive compounds include mesembrine (primary alkaloid, ~0.3–2.3% dry weight in whole plant material, higher in standardized extracts), mesembrenone (~0.1–1.0% dry weight), mesembrenol, and mesembranol — collectively comprising the 'mesembrine-type alkaloids' typically totaling 0.5–2.5% in raw dried plant material. Standardized commercial extracts (e.g., Zembrin®) are typically standardized to 0.35–0.4% total alkaloid content with defined mesembrine:mesembrenone ratios (~3.5:1). Oxalates are present as calcium oxalate crystals in the plant tissue, consistent with many succulent plants, though precise concentrations are not well-documented in literature. Fiber content is present as structural plant cellulose but quantitative data specific to Sceletium are limited in nutritional databases. Mineral content (calcium, potassium, magnesium) reflects typical succulent plant composition but is not nutritionally significant at supplemental doses. No meaningful vitamin content has been characterized. Bioavailability: mesembrine alkaloids are reported to be well-absorbed orally with relatively rapid onset (30–60 minutes), with some evidence of sublingual absorption being faster; first-pass hepatic metabolism is anticipated but pharmacokinetic data in humans remain limited to single-dose studies with Zembrin® extract.
How It Works
Mechanism of Action
Kanna's primary alkaloids mesembrine, mesembrenone, and mesembrenol inhibit serotonin reuptake by blocking the serotonin transporter (SERT). These compounds also inhibit phosphodiesterase-4 (PDE4), increasing cAMP levels and potentially reducing neuroinflammation. The dual action on serotonergic pathways and PDE4 may contribute to its anxiolytic and mood-regulating effects.
Clinical Evidence
Human research on kanna remains extremely limited, with most evidence derived from animal studies and in vitro research. Preclinical studies in rats have demonstrated anxiolytic effects at doses equivalent to 25-50mg in humans, with reduced anxiety-like behaviors in elevated maze tests. Small preliminary human trials suggest potential mood benefits, but no large-scale randomized controlled trials have been published. Current evidence is insufficient to establish clinical efficacy or optimal dosing protocols.
Safety & Interactions
Kanna may interact with antidepressants due to its serotonin reuptake inhibition, potentially causing serotonin syndrome when combined with SSRIs or MAOIs. Common reported side effects include mild sedation, headache, and gastrointestinal discomfort at higher doses. Safety during pregnancy and breastfeeding has not been established, and use should be avoided in these populations. Individuals taking psychiatric medications should consult healthcare providers before use.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Sceletium tortuosumKougoedChannaCannaKanna rootTortuose fig-marigoldHottentot fig
Frequently Asked Questions
What is the active compound in kanna?
The primary active compounds are mesembrine alkaloids, particularly mesembrine, mesembrenone, and mesembrenol, which comprise 0.3-2.3% of the dried plant material. Mesembrine is considered the most pharmacologically active component.
Can kanna be taken with antidepressants?
Kanna should not be combined with SSRIs, SNRIs, or MAOIs due to risk of serotonin syndrome from additive serotonergic effects. A washout period of at least 2 weeks is recommended when transitioning between these substances.
What is the recommended kanna dosage?
Traditional doses range from 50-200mg of standardized extract daily, though optimal dosing remains unestablished due to limited clinical research. Most commercial supplements contain 25-100mg per serving of standardized extract.
How long does kanna take to work?
Acute effects may be noticed within 30-60 minutes of consumption, while mood-related benefits may require consistent use over 2-4 weeks. Duration of effects typically lasts 2-4 hours per dose.
Is kanna legal in the United States?
Yes, kanna is legal in the United States and is classified as a dietary supplement ingredient. However, it cannot be marketed with specific medical claims without FDA approval.
What forms of kanna are available and do they differ in effectiveness?
Kanna is available in multiple forms including dried leaf powder, liquid extracts, capsules, and tinctures, with extraction methods varying between manufacturers. Currently, no human clinical trials directly compare the bioavailability or efficacy of different kanna forms, so effectiveness differences remain unclear. Most traditional use has been with dried leaf preparations chewed or smoked, while modern supplements often use standardized extracts. The lack of head-to-head human studies means form selection should be based on personal preference and product quality rather than proven superiority.
Is kanna safe during pregnancy and breastfeeding?
No safety data exists for kanna use during pregnancy or breastfeeding, and it should be avoided during these periods as a precaution. Kanna's serotonin-modulating properties theoretically could affect fetal development or pass into breast milk, but this has not been studied in humans. Pregnant and breastfeeding individuals should consult their healthcare provider before considering kanna supplementation. The lack of safety evidence makes avoidance the most prudent approach until clinical data becomes available.
How strong is the clinical evidence for kanna's mood and anxiety benefits in humans?
Clinical evidence for kanna's mood and anxiety effects in humans is currently very limited, with most research restricted to animal models and in vitro studies. No large randomized controlled trials (RCTs) in humans have definitively proven kanna's efficacy for depression, anxiety, or stress reduction. A small number of preliminary human studies suggest potential benefits, but these are insufficient to establish safety and effectiveness standards comparable to prescription medications. More rigorous human clinical trials are needed before kanna can be recommended as an evidence-based treatment for mental health conditions.
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