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Herb

Kanna (Sceletium)

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Kanna (Sceletium). South African succulent acting as SSRI + PDE4 inhibitor for mood and stress.

How it works. Mesembrine alkaloids inhibit SERT and PDE4 in cortical regions.

What the research supports. 2 graded claims. Strongest: Reduces stress and anxiety (moderate).

How much to take. Typical dose: 25 mg Zembrin.

Side effects and interactions. 1 medication interaction listed. No serious side effects listed at normal doses.

Stacking. Pairs well with Omega-3 (EPA/DHA), Alpha-GPC or CDP-choline.

Common forms. Available as Standardized extract capsule, Liquid tincture (alcohol or glycerin), Powdered whole herb, Traditional decoction or tea.

Key studies. 9 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Kanna (Sceletium). Anecdotes are not medical advice.

Kanna (Sceletium). South African succulent acting as SSRI + PDE4 inhibitor for mood and stress.

Key compound: mesembrineC17H23NO3 · 289.4 g/mol

What it is

South African succulent acting as SSRI + PDE4 inhibitor for mood and stress.

Also called

Sceletium tortuosumZembrin

Food sources

Whole dried plant material (root, leaf, flower, or aerial parts depending on the species)Standardized hydroethanolic or aqueous extract (capsule, tincture, or tea)Powdered traditional preparation used in Ayurvedic, TCM, or Western herbal practice

Goals

Mood & AnxietyBrain & Cognitive

How it works

Mesembrine alkaloids inhibit SERT and PDE4 in cortical regions.

Pathways

  • Mesembrine alkaloids inhibit SERT
  • PDE4 in cortical regions

Effects

  • ↓stress and anxiety decreases
  • +executive function (Zembrin) supports

What the research supports

Reduces stress and anxietymoderate
Improves executive function (Zembrin)limited

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
25 mg Zembrin
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodMorning
Best formMost evidence is based on the standardized extract capsule form.
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Side effects & interactions

Common side effects

  • Headache
  • GI upset

Medication interactions

SSRIs / MAOIssevere

Risk of serotonin syndrome.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Omega-3 (EPA/DHA)Membrane fluidity and neuronal signaling support.
  • Alpha-GPC or CDP-cholineProvides choline substrate for acetylcholine synthesis.

Common forms

  • Standardized extract capsule
  • Liquid tincture (alcohol or glycerin)
  • Powdered whole herb
  • Traditional decoction or tea

Key studies

9 studies cited in total.

PubMed: Kanna (Sceletium) — Reduces stress and anxiety ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Kanna (Sceletium) and "Reduces stress and anxiety". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Kanna (Sceletium) — Improves executive function ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Kanna (Sceletium) and "Improves executive function". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Kanna (Sceletium) — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Kanna (Sceletium) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

Discussion

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