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.
Origin
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.
Potential benefits
• Mood enhancement and stress reduction (traditional use, preclinical evidence only) • Anxiolytic (anti-anxiety) effects (animal models, no human RCTs available) • Potential antidepressant activity via serotonin reuptake inhibition (in vitro studies) • Anti-inflammatory properties (preclinical reviews, no human trials) • Antimicrobial effects (laboratory studies only, clinical evidence lacking)
How it works
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.
What the research says
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.
Safety and 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.
Suggested use
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.
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.
References
This article is educational and is not medical advice. Statements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Consult a healthcare professional before use.
