Canadine — l-Tetrahydroberberine (Isoquinoline Alkaloid · Sedative · Analgesic)
| Compound | Canadine (l-Tetrahydroberberine / THBC) |
| Chemical class | Alkaloid — Isoquinoline (Tetrahydroprotoberberine; Berberine Reduced Form) |
| CAS | 522-97-4 |
| Primary source | Hydrastis canadensis (goldenseal), Corydalis spp., Berberis spp. |
| Key applications | Sedative, anxiolytic, dopaminergic modulation, berberine metabolite |
| Claim strength | Moderate |
| Typical form | Goldenseal extract co-constituent; Corydalis extract; isolated canadine |
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Commercial source: Canadine (l-tetrahydroberberine) is commercially available as a co-constituent of goldenseal (Hydrastis canadensis) rhizome extract and as a constituent of Corydalis species extracts. Isolated canadine is available from specialist chemical suppliers. Contact Herbuno for sourcing availability. Traditional use: As a constituent of goldenseal, canadine participates in this plant’s traditional use in Native American and Western herbal medicine for infections, digestive complaints, respiratory mucous membrane conditions, and as a uterine tonic. Corydalis species containing canadine have analgesic and sedative traditional uses in TCM. Research trajectory: Canadine (l-tetrahydroberberine, l-THBC) is the fully reduced (tetrahydro) form of berberine — the same compound class as tetrahydropalmatine (THP). This structural relationship places it in the sedative/analgesic tetrahydroprotoberberine class. Research covers dopamine receptor modulation, GABA-A activity, analgesic effects, and its role as a possible in vivo metabolite of berberine. See sourcing options below.
Evidence for Canadine Applications
Sedative and CNS activity: Canadine potentiates GABA-A receptor activity and inhibits dopamine D1/D2 receptors, producing sedative and anxiolytic effects comparable to THP in rodent behavioural models. As a tetrahydroprotoberberine, its CNS pharmacology parallels THP (tetrahydropalmatine) from Corydalis — both belong to the same structural and pharmacological class. Claim strength: Moderate (preclinical).
Analgesic and anti-nociceptive: Canadine demonstrates analgesic activity in hot plate and writhing tests in rodent pain models. The mechanism (dopamine antagonism + GABA-A potentiation) is the same as THP. As a goldenseal constituent, canadine may contribute to that herb’s anti-inflammatory and pain-modulating properties. Claim strength: Moderate.
Berberine metabolism: In vivo studies suggest berberine is partially converted to dihydroberberine and potentially to tetrahydroberberine (canadine) by gut microbiota and hepatic metabolism. If confirmed, canadine may represent a biologically active berberine metabolite, broadening the pharmacological relevance of berberine supplementation to include tetrahydroprotoberberine CNS effects. Claim strength: Emerging (metabolic conversion hypothesis; mechanistic significance in humans unstudied).
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Dosage & Formulator Specification
No established isolated human supplement dose for canadine. As a goldenseal co-alkaloid, it is present at 1–5% of total alkaloid content alongside berberine (dominant). Standard goldenseal extract at 250–500 mg/day delivers canadine as a minor but pharmacologically relevant constituent. Isolated canadine is available as a research-grade material from specialist suppliers.
Goldenseal (Hydrastis canadensis) is a United Plant Savers (UPS) at-risk species in North America due to overharvesting. Formulators should specify cultivated goldenseal or select Berberis aristata, Coptis chinensis, or other berberine-rich species as more sustainably sourced alternatives to wild-harvested goldenseal for standard berberine supplementation.
Frequently Asked Questions — Canadine
Is canadine the same as tetrahydroberberine?
Yes — canadine and l-tetrahydroberberine (l-THBC) refer to the same compound. The name “canadine” derives from Hydrastis canadensis (Canadian goldenseal); l-tetrahydroberberine is the systematic name indicating it is berberine with all four ring nitrogen-adjacent double bonds reduced. It is the naturally occurring l-enantiomer; the d-enantiomer exists as a synthetic compound with different pharmacological properties.
How is canadine related to THP (tetrahydropalmatine)?
Both canadine and THP are l-tetrahydroprotoberberine alkaloids sharing the same tetracyclic tetrahydroisoquinoline scaffold. They differ in the number and arrangement of methoxy groups on the aromatic rings — THP has four methoxy groups; canadine has two methoxy and one methylenedioxy group (mirroring the berberine/palmatine structural relationship). Both produce sedative, analgesic, and dopamine-modulating effects via the same general pharmacological class mechanisms.
Is goldenseal sustainable to source?
Wild goldenseal is endangered/at-risk across most of its native North American range due to decades of overharvesting. United Plant Savers and CITES list it as a species of conservation concern. Cultivated goldenseal is available but premium-priced. For formulations where berberine is the target active, Berberis aristata, Coptis chinensis, or Phellodendron amurense are ecologically preferable alternatives with equivalent or superior berberine content and sustainable supply chains.
Is there clinical evidence for canadine specifically or only for goldenseal extract?
Clinical evidence exists for goldenseal extract as a whole (primarily antimicrobial applications) but not for isolated canadine. Canadine’s contribution to goldenseal pharmacology is inferred from its pharmacological class (tetrahydroprotoberberine) and its presence in the extract. No human clinical trials have tested isolated canadine as a supplement ingredient.
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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