Boldine (Aporphine Alkaloid · Hepatoprotective · Antioxidant · Choleretic)

Compound	Boldine
Chemical class	Alkaloid — Isoquinoline (Aporphine)
CAS	476-70-0
Primary source	Peumus boldus (boldo tree, Chile)
Key applications	Hepatoprotective, antioxidant, anti-inflammatory, choleretic
Claim strength	Moderate
Typical form	Boldo leaf extract standardised to boldine; boldine isolate
Buy from Herbuno	Request availability and bulk pricing →

Commercial source: Boldine is commercially available as a standardised constituent of boldo (Peumus boldus) leaf extract from specialist botanical suppliers. Isolated boldine (≥98% HPLC) is available from specialist chemical suppliers. Contact Herbuno for availability assessment. Traditional use: Boldo (Peumus boldus) is a Chilean endemic tree whose leaves have been used in South American traditional medicine for centuries for liver and gallbladder complaints, digestive disorders, and as a diuretic. Boldo leaf preparations were adopted into European phytomedicine in the 19th century and are now included in several national pharmacopoeias for liver and biliary indications. Boldine is identified as the primary alkaloid responsible for boldo’s hepatoprotective and choleretic properties. Research trajectory: Boldine has a well-characterised preclinical evidence base for hepatoprotective (antioxidant, anti-inflammatory), choleretic (bile-stimulating), and anti-inflammatory mechanisms. It is one of the most potent natural antioxidants identified, with ORAC values among the highest for small phenolic molecules. See sourcing options below.

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Evidence for Boldine Applications

Hepatoprotective and antioxidant: Boldine is an exceptionally potent antioxidant — its catechol-type aporphine scaffold provides high radical-scavenging capacity, Nrf2 activation, and direct lipid peroxidation inhibition. In CCl4, paracetamol, and alcohol-induced liver injury animal models, boldine consistently reduces hepatic ALT/AST elevation and oxidative damage markers. The antioxidant potency is reported to significantly exceed alpha-tocopherol in some assay systems. Claim strength: Moderate.

Choleretic (bile-stimulating): Boldine increases bile production and flow in animal models, supporting its traditional use for liver and gallbladder complaints. Commission E (Germany) has approved boldo leaf for dyspeptic complaints and mild spasmodic gastrointestinal conditions, providing a regulatory precedent for biliary applications. Claim strength: Moderate.

Anti-inflammatory and immunomodulatory: Boldine inhibits NF-κB, COX-2, and reduces pro-inflammatory cytokine production. It modulates T-cell function and has documented immunosuppressive activity in some models — potentially relevant for autoimmune and inflammatory conditions. Claim strength: Moderate.

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Dosage & Formulator Specification

German Commission E approved boldo leaf dose: 3 g dried leaf/day (as infusion) or equivalent extract. For boldine-standardised extract: 60–180 mg/day boldine equivalent is a working range for hepatoprotective applications. Boldo leaf contains 0.25–0.7% total alkaloids with boldine as the dominant alkaloid (60–70% of total).

Safety note: Boldo leaf contains ascaridole — a naturally occurring monoterpene peroxide with hepatotoxic potential at high doses. Pharmaceutical-grade boldo leaf preparations and essential oil are controlled for ascaridole content. Dry boldo leaf preparations at normal doses have an established safety record; boldo essential oil (high ascaridole) is hepatotoxic and must not be used internally. Contraindicated in liver disease, bile duct obstruction, and pregnancy. Request ascaridole content CoA for any boldo extract intended for oral supplement use.

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Frequently Asked Questions — Boldine

Is boldine the most potent natural antioxidant alkaloid?
Boldine consistently ranks among the highest antioxidant alkaloids in comparative studies, with values significantly exceeding alpha-tocopherol, BHA, and BHT in lipid peroxidation inhibition assays. The catechol/pyrogallol aporphine scaffold provides both high radical-scavenging capacity and metal-chelating activity. Whether this in vitro superiority translates to superior in vivo antioxidant protection depends on bioavailability and tissue distribution — which are less well-characterised for boldine than for polyphenols with larger human evidence bases.

Is boldo Commission E approved and what does that mean for supplement positioning?
German Commission E approved boldo leaf for dyspeptic complaints and mild spasmodic GI conditions (positive monograph). ESCOP (European Scientific Cooperative on Phytotherapy) also has a boldo monograph. These phytomedicine regulatory approvals in Europe provide a basis for supplement claim positioning in EU markets beyond what typical supplement claims allow — though national regulatory requirements still apply. For supplement markets, traditional herbal medicine registration (THR) in relevant markets is the practical regulatory route.

What is the difference between boldo leaf extract and boldo essential oil?
Boldo leaf dry extract (used in supplements and herbal preparations) contains boldine alkaloids with low ascaridole levels; safety at normal doses is well-established. Boldo essential oil is concentrated in ascaridole (up to 30%), which is hepatotoxic and genotoxic. These are entirely different products with different safety profiles. Boldo essential oil must not be used in oral supplements. Always specify dry aqueous or hydroethanolic boldo leaf extract, not essential oil, for supplement applications.

Can boldine replace silymarin in liver health formulations?
Boldine and silymarin have complementary but distinct hepatoprotective mechanisms: boldine primarily via direct antioxidant activity and choleretic effect; silymarin via hepatocyte membrane stabilisation, RNA polymerase I activation, and protein synthesis promotion. A combined boldine + silymarin formulation would address multiple complementary aspects of liver protection. Neither is the complete substitute for the other in clinical hepatology; both are appropriate supplement-grade liver support ingredients.

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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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