Herbal Monograph
Burdock
Arctium lappa L.
Asteraceae (Compositae)
Classic Western alterative for chronic skin conditions, with diuretic, bitter...
Overview
Plant Description
Robust biennial herb, 50-200 cm (occasionally to 300 cm) tall in the second year. First-year growth produces a dense basal rosette of very large, broadly ovate to cordate leaves with long, solid petioles. Second-year stems are erect, stout, branching, grooved, and often reddish-tinged. Leaves alternate, broadly ovate to cordate, 30-50 cm long and nearly as wide in basal leaves, with entire to slightly denticulate and wavy margins; upper surface dark green and subglabrous, lower surface densely gray-white tomentose (woolly pubescent). Petioles of basal leaves solid (distinguishing feature from A. minus which has hollow petioles). Flower heads (capitula) globose, 2.5-4 cm in diameter, arranged in racemose or corymbose clusters. Involucral bracts numerous, narrow, each tipped with a recurved hook (the origin of Velcro), glabrous or slightly arachnoid. Florets all tubular (no ray florets), purple to pink-purple, protruding above the involucre. Fruits are achenes, oblong, 5-8 mm long, compressed, ribbed, gray-brown with dark spots, crowned by a short pappus of rough bristles. Taproot long, fleshy, fusiform, up to 1 m deep and 2 cm across, externally dark grayish-brown to black-brown, internally whitish and somewhat mucilaginous when fresh, becoming horn-like and longitudinally wrinkled when dried.
Habitat
Grows in disturbed ground, roadsides, waste places, field margins, ditch banks, and woodland edges. Prefers moderately rich, moist, well-drained soils but tolerates a wide range of conditions including heavy clay. Thrives in full sun to partial shade. Commonly found on nitrogen-rich soils near habitation. Hardy to USDA zones 3-10. Considered an invasive weed in parts of North America and Australia.
Distribution
Native to temperate Eurasia, from Scandinavia and the British Isles east through central and southern Europe to Siberia, China, and Japan. Widely naturalized in North America (introduced by European settlers), South America, Australia, and New Zealand. Cultivated as a vegetable crop (gobo) extensively in Japan, Korea, and Taiwan, and to a lesser extent in parts of Europe and Hawaii.
Parts Used
Root (Arctii radix / Bardanae radix)
Preferred: Dried root for decoction, dried root for tincture, fresh root for culinary/dietary use
The root is the primary medicinal part in Western herbalism and the part specified in the EMA Community Herbal Monograph and the German Commission E monograph. The root is the richest source of inulin (up to 45% of dry weight in first-year autumn roots), phenolic acids (chlorogenic acid, caffeic acid), and lignans (arctiin, arctigenin). It also contains polyacetylenes with antimicrobial activity. The EMA monograph specifies root collected in the autumn of the first year or spring of the second year from A. lappa, A. minus, or A. tomentosum. The root is official in the German Pharmacopoeia (DAC 2008) and the British Herbal Pharmacopoeia (BHP 1983, 1996).
Seed / Fruit (Arctii fructus / Niu Bang Zi)
Preferred: Dried seeds for decoction (TCM); tincture of fresh seeds (Eclectic practice)
The seed (technically the achene/fruit) is the primary part used in Traditional Chinese Medicine (as Niu Bang Zi) and was also valued by Eclectic physicians in North America. Seeds contain higher concentrations of the lignan arctigenin and its glycoside arctiin than the root, as well as significant fixed oil (15-20%). The Eclectics considered the seeds 'very efficient diuretics' and used them for kidney conditions, boils, and styes. In TCM, the seeds are used to dispel wind-heat, clear heat toxins, and benefit the throat. Seeds are not included in the EMA monograph which covers only the root.
Leaf (Arctii folium)
Preferred: Fresh leaf poultice
Leaves are used in folk medicine primarily as topical poultices for bruises, burns, and inflammatory skin conditions. They contain polyphenolic antioxidants but lower concentrations of the characteristic lignans compared to root and seed. Leaf use is not supported by pharmacopeial monographs and has minimal clinical evidence. External use as a fresh poultice is the main traditional application.
Key Constituents
Polysaccharides (Fructans)
The inulin and mucilage fraction is responsible for the prebiotic, demulcent, and mild laxative actions of burdock root. Inulin promotes healthy gut microbiota, supports bowel regularity, and may contribute to blood glucose and lipid regulation through modulation of nutrient absorption and short-chain fatty acid production. These constituents are best extracted in water-based preparations (decoctions, infusions).
Lignans
The lignan fraction — particularly arctiin and its aglycone arctigenin — is responsible for many of the anti-inflammatory, antioxidant, hypoglycemic, and potential antitumor activities attributed to burdock. Arctigenin inhibits NF-kB, iNOS, COX-2, and multiple pro-inflammatory cytokines. It also modulates insulin signaling pathways. The lignan fraction is extracted in both aqueous and hydroalcoholic preparations. Seeds contain the highest lignan concentrations.
Phenolic acids and caffeoylquinic acid derivatives
The phenolic acid fraction contributes major antioxidant, hepatoprotective, and anti-inflammatory activity. Chlorogenic acid and dicaffeoylquinic acid derivatives are well-characterized radical scavengers and inhibitors of lipid peroxidation. This fraction supports burdock's traditional use as a liver-supportive and 'blood purifying' herb. Phenolic acids are efficiently extracted in both aqueous and hydroalcoholic preparations.
Polyacetylenes (sulfur-containing acetylenic compounds)
The polyacetylene fraction is primarily responsible for the antimicrobial and antifungal activity of burdock root. These compounds demonstrate activity against dermatophytes, Candida spp., Staphylococcus aureus, and Escherichia coli. The antimicrobial action supports burdock's traditional use for skin infections, boils, and abscesses. Polyacetylenes are lipophilic and are best extracted in alcohol-based preparations.
Flavonoids
The flavonoid fraction contributes antioxidant and anti-inflammatory activity but is not a primary constituent class of the root. Flavonoid content is higher in the leaves than in the root. Flavonoids synergize with the phenolic acid and lignan fractions.
Other constituents
Minor constituents providing ancillary therapeutic effects. The phytosterol and mineral content support burdock's traditional classification as a nutritive alterative. The trace sesquiterpene lactone content is relevant only to the allergy risk assessment for Asteraceae-sensitive individuals.
Herbal Actions
Burdock root is one of the classic alterative ('blood purifying') herbs of Western herbalism. The alterative action reflects the combined effects of improved hepatic metabolism, enhanced elimination via kidneys and bowel, and direct anti-inflammatory and antioxidant effects on skin and connective tissue. Hoffmann lists burdock as an alterative with particular affinity for the skin, useful in conditions arising from metabolic toxicity and sluggish eliminative function. Mills and Bone describe the alterative action as a gradual restoration of proper tissue function, especially relevant in chronic skin disease. The Commission E approved burdock root for supportive treatment of skin conditions, reflecting this traditional alterative use.
[1, 5, 6]Increases urine production and output
Burdock root has a well-established diuretic action, recognized by the EMA Community Herbal Monograph for 'adjuvant in minor urinary tract complaints.' The diuretic effect supports elimination of metabolic waste products and contributes to the overall alterative/depurative action. The British Herbal Pharmacopoeia classifies burdock as a diuretic. The Eclectics considered the seeds even more strongly diuretic than the root.
[1, 2, 5, 8]The bitter principles in burdock root (sesquiterpene lactones, phenolic acids) stimulate digestive secretions including saliva, gastric acid, and bile. The EMA monograph recognizes burdock root for 'temporary loss of appetite.' The choleretic action — promoting bile flow — is attributed to caffeoylquinic acid derivatives (including cynarin/1,3-dicaffeoylquinic acid) and supports the traditional use for sluggish digestion and hepatobiliary insufficiency. Hoffmann classifies burdock as a bitter tonic.
[1, 2, 5]Reduces inflammation
The lignan fraction (arctiin/arctigenin) demonstrates anti-inflammatory activity through inhibition of NF-kB, iNOS, COX-2, and pro-inflammatory cytokines (IL-6, TNF-alpha). The clinical trial by Maghsoumi-Norouzabad et al. (2016) demonstrated significant reduction in serum IL-6 and hs-CRP in osteoarthritis patients consuming burdock root tea. The phenolic acid fraction also contributes antioxidant and anti-inflammatory effects. While anti-inflammatory activity is well-demonstrated in preclinical models and one clinical trial, the clinical evidence base is still developing.
[6, 9, 11]Kills or inhibits the growth of microorganisms
Polyacetylene constituents (arctinone, arctinol, arctic acid derivatives) demonstrate in vitro activity against dermatophytes, Candida albicans, Staphylococcus aureus, and Escherichia coli. Arctigenin has demonstrated antibacterial and anti-virulence activity against Pseudomonas aeruginosa. The antimicrobial action supports the traditional topical use for boils, abscesses, and skin infections.
[6, 11]The high inulin content (up to 45% of dried root) acts as a prebiotic, selectively promoting growth of beneficial gut bacteria (Bifidobacterium, Lactobacillus spp.) and production of short-chain fatty acids. This action supports gastrointestinal health, immune function, and may contribute to the traditional alterative effect through improved gut barrier function and reduced systemic endotoxin exposure.
[11]Preclinical studies demonstrate that burdock root extract and arctigenin reduce fasting blood glucose and improve insulin sensitivity in diabetic animal models. Arctigenin modulates the IRS2/GLUT4 pathway and stimulates insulin secretion. Inulin may contribute via modulation of postprandial glucose absorption. Clinical evidence in humans is limited to a small study showing improved lipid metabolism and postprandial blood glucose in diabetic nephropathy patients. The action is considered mild and supportive rather than a primary hypoglycemic effect.
[11]Therapeutic Indications
Skin / Integumentary
Eczema and dermatitis (chronic, dry, scaly)
Commission E approved burdock root for 'supportive therapy of skin conditions.' The EMA monograph recognizes traditional use for 'seborrhoeic skin conditions.' Hoffmann specifically recommends burdock for dry and scaly skin conditions, eczema, and dandruff. The Eclectics valued it highly for 'dry, scaly skin eruptions' and 'feeble cutaneous circulation.' The alterative, anti-inflammatory, and antimicrobial actions combine to address chronic inflammatory dermatoses. Long-term use (4-12 weeks minimum) is typically required.
[1, 2, 5, 13]Psoriasis
Burdock is one of the most frequently cited alterative herbs for psoriasis in both Eclectic and modern Western herbal literature. Felter (1922) considered it 'especially valuable in psoriasis.' Hoffmann recommends long-term use of burdock for psoriasis, typically in combination with other alteratives (yellow dock, cleavers, sarsaparilla). Clinical evidence is limited to traditional reports and case series; no controlled trials for psoriasis have been published.
[5, 6, 13]Acne, boils, and furunculosis
Traditional use across European and Eclectic traditions for recurrent boils, styes, and acne. Felter lists 'recurrent boils and styes' as a specific indication. The Commission E monograph supports use in skin conditions. The antimicrobial (polyacetylenes), anti-inflammatory (arctigenin), and alterative actions provide a pharmacological rationale. Used internally as decoction or tincture and can be combined with topical application.
[1, 5, 13]Seborrhoeic dermatitis and dandruff
The EMA monograph specifically recognizes burdock root for 'seborrhoeic skin conditions,' applied both internally (oral decoction/tincture) and externally (decoction as rinse or compress). Burdock's ability to regulate sebaceous gland function is noted in the traditional literature. It may be applied as a decoction hair rinse for dandruff and oily scalp conditions.
[2, 5]Musculoskeletal System
Osteoarthritis (adjunctive anti-inflammatory support)
Maghsoumi-Norouzabad et al. (2016) conducted a randomized, single-blind, placebo-controlled clinical trial in 36 patients with knee osteoarthritis. Burdock root tea (3 cups/day, each 2 g/150 mL, for 42 days) significantly decreased serum IL-6 (P=0.002) and hs-CRP (P=0.003) while increasing serum total antioxidant capacity (P<0.001) and SOD activity (P=0.009). A companion study showed improvements in lipid profile and blood pressure. Results are promising but from a single small trial requiring replication.
[9, 10]Rheumatic conditions (gout, rheumatism)
Traditional use in European herbalism and Eclectic medicine for rheumatic and gouty conditions. King's American Dispensatory notes use in 'rheumatic, gouty, venereal, leprous, and other disorders.' The diuretic and anti-inflammatory actions provide a pharmacological rationale. Clinical evidence is limited to traditional reports.
[5, 14]gastrointestinal
Loss of appetite and dyspepsia
The EMA Community Herbal Monograph recognizes burdock root for 'temporary loss of appetite' based on traditional use. The bitter principles stimulate appetite and digestive secretions. The choleretic action supports fat digestion and biliary function. Felter noted benefit in 'dyspepsia due to irritation of the stomach in cachectic individuals.'
[2, 13]Dysbiosis and sluggish bowel function
The high inulin content acts as a prebiotic, supporting healthy intestinal microbiota. Inulin promotes growth of Bifidobacterium and Lactobacillus species and production of short-chain fatty acids (butyrate, propionate) that nourish colonocytes and support gut barrier integrity. The mild laxative action helps normalize bowel function. While inulin's prebiotic effects are well-established in the nutrition literature, specific clinical trials of burdock root decoction for dysbiosis are lacking.
[11]Urinary System
Minor urinary tract complaints (adjunctive diuretic support)
The EMA Community Herbal Monograph recognizes burdock root as an 'adjuvant in minor urinary tract complaints' based on traditional use. The diuretic action increases urine output and supports flushing of the urinary tract. Used traditionally for cystitis, urinary gravel, and urinary irritation. Felter lists 'urinary irritation' among the specific indications.
[2, 8, 13]Hepatobiliary System
Hepatobiliary insufficiency and sluggish liver function
Traditional use as a choleretic and liver-supportive herb. The caffeoylquinic acid derivatives have demonstrated hepatoprotective and choleretic activity. Chlorogenic acid protects hepatocytes from oxidative damage. Traditional use for jaundice and hepatic congestion documented by the Eclectics. Hoffmann describes burdock's role in supporting hepatic metabolic function as part of its alterative action.
[5, 11, 14]metabolic-endocrine
Type 2 diabetes (adjunctive support)
Preclinical evidence demonstrates that burdock root extract and arctigenin reduce blood glucose, improve insulin sensitivity, and modulate lipid metabolism in diabetic animal models. Arctigenin modulates the IRS2/GLUT4 pathway and stimulates insulin secretion. A small clinical study showed improved postprandial blood glucose and lipid metabolism in patients with diabetic nephropathy. Evidence is still preliminary and insufficient to recommend burdock as a standalone antidiabetic agent, but it may have adjunctive value.
[11]Energetics
Temperature
cool
Moisture
moist
Taste
Tissue States
hot/excitation, damp/stagnation, dry/atrophy (of the skin)
Burdock root has a complex energetic profile. It is generally classified as cooling and moistening in Western herbalism, making it particularly suited to hot, inflammatory, and dry tissue states. The cooling quality addresses heat and excitation in the skin (acne, boils, eczematous inflammation), while the moistening quality — driven by its high inulin and mucilage content — nourishes dry, atrophic tissues. The bitterness stimulates digestive and hepatobiliary function (addressing damp/stagnation), while the sweetness and oiliness are nutritive and moistening. Hoffmann describes burdock as indicated for dry, scaly skin conditions, reflecting its ability to address dry/atrophic tissue states through improved nutrition and elimination. Some authors note that burdock is close to energetically neutral in temperature due to the balance of its bitter (cooling/drying) and sweet/oily (warming/moistening) qualities, though the overall direction is gently cooling. In TCM, Niu Bang Zi (the seed) is classified as acrid and bitter, cold, entering the Lung and Stomach channels — used to dispel wind-heat and clear heat-toxins.
Traditional Uses
European traditional herbalism (Western herbal medicine)
- Alterative/blood purifier for chronic skin conditions (eczema, psoriasis, acne, boils)
- Diuretic for urinary complaints and to promote elimination
- Bitter tonic for loss of appetite and sluggish digestion
- Choleretic for liver and gallbladder support
- Diaphoretic to promote perspiration in febrile conditions
- Topical decoction or poultice for wounds, ulcers, and skin eruptions
"Hoffmann (2003): 'Burdock is a valuable remedy that has a wide range of actions and can be used for an equally wide range of problems. It is a classic alterative and one of the best blood purifiers. It is used for all skin diseases where there is a dry and scaly condition, eczema, dandruff, and psoriasis (taken over a long period). Used for rheumatism and associated with urinary conditions such as cystitis.'"
[5]
Eclectic medicine (American, 19th-20th century)
- Alterative and diuretic for chronic skin conditions with feeble cutaneous circulation
- Treatment of psoriasis, eczema, crusta lactea, and stubborn ulcers
- Remedy for recurrent boils and styes
- Diuretic for kidney diseases and urinary irritation
- Treatment for catarrhal and aphthous ulcerations
- Sudorific and alterative for rheumatic and gouty conditions
"Felter (1922, Eclectic Materia Medica): 'Lappa is a potent but neglected alterative and diuretic. It relieves urinary and bronchial irritation, favors the elimination of waste material, and secondarily proves tonic. Lappa is especially valuable in psoriasis, crusta lactea, stubborn eczema, obstinate ulcers, and in catarrhal and aphthous ulcerations. It is one of the best of agents for recurrent boils and styes.' Specific Indications: 'Feeble cutaneous circulation; dry, scaly skin eruptions; aphthous ulcers; recurrent boils and styes; urinary irritation; psoriasis.'"
[13]
Traditional Chinese Medicine (TCM)
- Niu Bang Zi (seeds): Dispel wind-heat, clear heat and relieve toxicity
- Benefit the throat — sore throat, cough, and early-stage febrile diseases
- Clear heat-toxins — boils, carbuncles, and skin eruptions
- Promote eruption of rashes in measles
- Root used as food and dietary therapy for blood purification and digestive support
"In TCM, Niu Bang Zi (the fruit/seed of Arctium lappa) is classified as acrid and bitter in taste, cold in nature, entering the Lung and Stomach channels. It is used to dispel wind-heat, clear heat, and relieve toxicity. The root is used more as a food than as medicine in TCM, but is valued for its ability to clear heat and support digestion. Burdock root and seeds have appeared in TCM texts for hundreds of years."
[11]
Japanese Kampo medicine and cuisine
- Gobo (burdock root) consumed widely as a vegetable and health food
- Used to stimulate digestion, improve appetite, and relieve gastrointestinal discomfort
- Valued as a diuretic for edema and urinary conditions
- Kinpira gobo (sauteed burdock root) eaten as a traditional health-promoting dish
- Used in Kampo formulas for detoxification and skin conditions
"Burdock root (gobo) is one of the most commonly consumed root vegetables in Japan and is deeply embedded in Japanese dietary culture. It is valued both as a nutritious food and for its therapeutic properties in Kampo (Japanese herbal medicine), where it is used to support digestion, promote diuresis, and treat skin conditions."
[11]
German phytotherapy (Commission E / EMA / ESCOP)
- Internal and external: supportive therapy for skin conditions
- Internal: adjuvant in minor urinary tract complaints
- Internal: temporary loss of appetite
- External: seborrhoeic skin conditions
"The German Commission E approved burdock root for supportive therapy of skin conditions. The EMA Community Herbal Monograph (EMA/HMPC/246763/2009) recognizes traditional use for: (a) adjuvant in minor urinary tract complaints, (b) temporary loss of appetite, and (c) seborrhoeic skin conditions. ESCOP (2016) extends indications to include internal and external use for seborrhoeic skin, eczema, furuncles, acne, psoriasis, and minor urinary tract disorders."
Modern Research
Osteoarthritis — anti-inflammatory and antioxidant effects
Randomized, single-blind, placebo-controlled clinical trial evaluating burdock root tea in patients with knee osteoarthritis.
Findings: Maghsoumi-Norouzabad et al. (2016) randomized 36 patients (aged 50-70) with knee osteoarthritis to burdock root tea (3 cups/day, each 2 g/150 mL boiled water, for 42 days) or water control, alongside standard treatment (acetaminophen and glucosamine). Burdock root tea significantly decreased serum IL-6 (P=0.002), hs-CRP (P=0.003), and malondialdehyde (MDA), while significantly increasing total antioxidant capacity (TAC, P<0.001) and SOD activity (P=0.009). A companion study (2019) from the same trial reported improvements in lipid profile and blood pressure.
Limitations: Small sample size (n=36). Single-blind design. Short duration (42 days). Single-center study. All patients received concurrent acetaminophen and glucosamine, making it difficult to isolate the specific contribution of burdock root tea. No functional outcome measures (pain, mobility) were reported — only biomarkers. Replication in larger trials is needed.
Pharmacological review — comprehensive assessment of Arctium lappa
Narrative review summarizing the known pharmacological effects of Arctium lappa across all plant parts.
Findings: Chan et al. (2011) reviewed the literature on burdock's biological activities. Key findings: root extracts demonstrate antioxidant, antidiabetic, and hepatoprotective activity attributed primarily to chlorogenic acid, caffeic acid, and inulin. Seed extracts demonstrate anti-inflammatory and antitumor activity attributed to arctigenin and arctiin. Leaf extracts show antimicrobial activity against oral pathogens. The review identified the major active constituents as tannin, arctigenin, arctiin, beta-eudesmol, caffeic acid, chlorogenic acid, inulin, trachelogenin, sitosterol-beta-D-glucopyranoside, lappaol, and diarctigenin.
Limitations: Narrative review, not systematic. Most evidence cited was from in vitro and animal studies. Limited human clinical data was available at the time of publication.
[11]
Arctigenin — anti-inflammatory mechanism and pharmacokinetics
Review of the anti-inflammatory effects, pharmacokinetic properties, and clinical efficacy of arctigenin and arctiin from Arctium lappa.
Findings: Arctigenin exhibits potent anti-inflammatory activity through multiple mechanisms: inhibition of NF-kB signaling, suppression of iNOS expression and nitric oxide production, downregulation of COX-2, and modulation of pro-inflammatory cytokines (TNF-alpha, IL-1beta, IL-6). Arctigenin also demonstrates immunomodulatory activity, suppressing Th17 cell differentiation via AMPK and PPAR-gamma/ROR-gamma-t signaling pathways. Oral bioavailability is acceptable, with arctiin being hydrolyzed to arctigenin by intestinal microflora. Preclinical evidence supports potential therapeutic application in inflammatory and autoimmune conditions.
Limitations: Most evidence is preclinical (cell culture and animal models). The immunosuppressive potential is a double-edged sword requiring careful dose optimization. Clinical trials in humans are very limited.
[12]
Antidiabetic activity
Preclinical studies evaluating burdock root and arctigenin for antidiabetic effects.
Findings: Multiple animal studies demonstrate that burdock root extract (200-400 mg/kg body weight) reduces fasting blood glucose in streptozotocin-induced diabetic rats in a dose-dependent manner, with improvements in serum insulin and lipid profile. Arctigenin specifically mitigates insulin resistance by modulating the IRS2/GLUT4 pathway via TLR4 in type 2 diabetes mellitus mice, reducing blood glucose and lipid levels and reversing liver and pancreas tissue damage. Arctigenic acid (50 mg/kg, twice daily for 12 weeks) stimulated insulin secretion and significantly reduced blood glucose in Goto-Kakizaki rats.
Limitations: All studies are in animal models (rats and mice). Doses used may not translate directly to human clinical doses. No large-scale randomized controlled trials in human diabetic patients have been conducted with burdock root as the primary intervention.
[11]
Antimicrobial activity
In vitro evaluation of burdock root extracts and isolated compounds against bacterial and fungal pathogens.
Findings: Polyacetylenes (arctinone, arctinol, arctic acid derivatives) isolated from burdock root demonstrate antimicrobial activity against dermatophytes, Candida albicans, Staphylococcus aureus, and Escherichia coli. Arctigenin exhibits antibacterial and anti-virulence activity against Pseudomonas aeruginosa, including inhibition of biofilm formation. Root extracts showed improved antimicrobial activity with increasing concentration against Aspergillus niger, C. albicans, S. aureus, and E. coli.
Limitations: In vitro studies only. MIC values are generally higher than conventional antibiotics. Clinical relevance as a standalone antimicrobial is not established; the antimicrobial action is more relevant as an adjunct in the context of topical wound care and skin conditions.
[11]
Preparations & Dosage
Decoction
Strength: 2-6 g dried root per 250-500 mL water
Add 2-6 g of dried, sliced or chopped burdock root to 250-500 mL of cold water. Bring to a boil, then reduce heat and simmer gently for 10-20 minutes. Strain. Decoction is the preferred aqueous preparation for burdock root because the hard, woody root requires sustained heat to extract inulin, phenolic acids, and lignans effectively. Infusion (pouring boiling water over the root) is less effective than decoction for this root drug.
2-6 g dried root per day, taken as decoction in 2-3 divided doses (i.e., approximately 1-2 g per cup, 2-3 cups daily)
2-3 times daily
For skin conditions: minimum 4-12 weeks, often longer (3-6 months) for chronic conditions. For appetite stimulation: 1-2 weeks. For urinary complaints: 2-4 weeks, then reassess.
Not recommended for children under 12 without practitioner guidance. Children 12-18 years: half adult dose.
Decoction is the preparation form specified in the EMA monograph and is the most traditional method. It effectively extracts the water-soluble constituents (inulin, mucilage, phenolic acids, and some lignans). The resulting decoction has a mildly sweet then bitter taste. Can be combined with other alterative herbs (yellow dock, cleavers, red clover, sarsaparilla) in skin formulas.
Tincture
Strength: 1:5 dried root in 25-45% ethanol; 1:10 in 45% ethanol (EMA specification); 1:2 fresh root in 45-60% ethanol
Macerate dried burdock root in 25-45% ethanol at a ratio of 1:5 for 2-4 weeks, shaking daily. Press, filter, and bottle. For fresh root tincture, use 1:2 ratio in 45-60% ethanol.
2-4 mL of 1:5 tincture (in 25-45% ethanol), 3 times daily. Alternatively, 2-8 mL per day depending on strength and indication.
3 times daily
For chronic skin conditions: 4-12 weeks minimum, often 3-6 months. For digestive/appetite support: 2-4 weeks.
Not recommended for children under 12 without practitioner guidance
Tincture extracts both water-soluble and lipophilic constituents more completely than decoction alone. The hydroalcoholic extract captures lignans, polyacetylenes, and phenolic acids. The EMA monograph specifies tincture (1:10) in ethanol 45% V/V and tincture (1:5) as recognized preparations. The BHP specifies 1:5 tincture in 25% ethanol. Tincture is convenient for long-term use in chronic skin conditions.
liquid-extract
Strength: DER 1:1, extraction solvent ethanol 25% V/V (EMA specification)
Use commercially prepared liquid extract (DER 1:1) with ethanol 25% V/V as specified by the EMA monograph.
Liquid extract (1:1 in 25% ethanol): dose as directed by manufacturer, typically 2-8 mL per day in divided doses
2-3 times daily
As for tincture
Not recommended for children under 12 without practitioner guidance
The liquid extract is a more concentrated preparation than the tincture. The EMA monograph lists liquid extract (DER 1:1) as a recognized preparation form. Follow manufacturer's dosage recommendations.
[2]
powdered-root
Strength: 350 mg capsules (EMA specification); or bulk powder 1-2 g per dose
Dried burdock root ground to a fine powder. Can be encapsulated or mixed into food or liquid.
350 mg powder, 3 to 5 times daily (EMA specification); alternatively, 1-2 g powder 3 times daily
3-5 times daily
As for decoction
Not recommended for children under 12 without practitioner guidance
Powdered root is convenient for encapsulation. The EMA monograph specifies 350 mg 3-5 times daily as a recognized posology for the powdered herbal substance. Powder retains all constituents including inulin, lignans, and polyacetylenes.
[2]
topical
Strength: 10-20 g dried root per 500 mL water for topical decoction
Prepare a strong decoction (10-20 g dried root per 500 mL water, simmered for 20-30 minutes) for use as a wash, compress, or hair rinse. Apply the warm decoction directly to affected skin or soak a cloth and apply as a compress. For a poultice, apply fresh grated root or reconstituted dried root powder directly to the skin.
Apply decoction or compress to affected area 2-3 times daily
2-3 times daily or as needed
Until improvement; for chronic skin conditions, continue alongside internal treatment
Topical use suitable for children over 12 (EMA monograph restriction)
Topical application is specifically recognized by the EMA monograph for seborrhoeic skin conditions. The fresh pulp of the root or a decoction can be directly applied to the skin. Topical use complements internal use for skin conditions. Traditionally used as a hair rinse for dandruff and seborrhoeic dermatitis of the scalp.
culinary/dietary
Strength: Fresh root used as food
Fresh burdock root (gobo) is peeled, sliced or julienned, and briefly soaked in acidulated water to prevent browning. It can be sauteed (kinpira), braised, added to soups and stews, or pickled. The root has a crisp texture and mild, earthy, slightly sweet flavor.
30-60 g fresh root daily as a dietary vegetable; no specific limit for culinary use
As a regular dietary inclusion
Ongoing as a health-promoting food
Suitable as a food for children of appropriate age
Dietary consumption of burdock root is extensive in Japan (gobo), Korea (ueong), and Taiwan. As a food, burdock root provides prebiotic fiber (inulin), minerals, and antioxidants. The culinary tradition supports long-term safety. The prebiotic effect of regular dietary consumption contributes to gastrointestinal health. Dietary use is complementary to medicinal preparations.
[11]
Safety & Interactions
Class 1
Can be safely consumed when used appropriately (AHPA Botanical Safety Handbook)
Contraindications
Cross-reactive allergic contact dermatitis or, rarely, anaphylaxis may occur in individuals with known sensitization to other Asteraceae species (ragweed, chrysanthemum, chamomile, arnica, etc.). Sesquiterpene lactones are present in trace amounts in burdock root but can trigger reactions in highly sensitized individuals. The EMA monograph states that burdock preparations should not be used in cases of hypersensitivity to the Compositae. Although the risk is low (burdock has very low sesquiterpene lactone content), a history of Asteraceae allergy is a contraindication.
The EMA monograph states that burdock root preparations should not be used 'in patients with oedema due to impaired heart or kidney function.' Herbal diuretics are not appropriate as the sole treatment for fluid retention from cardiac or renal failure, and may mask worsening of the underlying condition.
Drug Interactions
| Drug / Class | Severity | Mechanism |
|---|---|---|
| Hypoglycemic agents (insulin, metformin, sulfonylureas, etc.) (Antidiabetic drugs) | theoretical | Burdock root extracts and arctigenin have demonstrated hypoglycemic effects in animal models, reducing fasting blood glucose and improving insulin sensitivity. Concurrent use may theoretically potentiate the hypoglycemic effect of antidiabetic medications. |
| Anticoagulant and antiplatelet agents (warfarin, aspirin, clopidogrel) (Anticoagulants / Antiplatelets) | theoretical | Some sources suggest burdock may have mild antiplatelet activity, though the evidence is sparse. The interaction is largely theoretical and based on the general caution applied to many herbal preparations. |
| Diuretic medications (Diuretics) | theoretical | Additive diuretic effect. Burdock root has recognized diuretic activity and concurrent use with pharmaceutical diuretics may theoretically increase fluid and electrolyte loss. |
Pregnancy & Lactation
Pregnancy
possibly unsafe
Lactation
insufficient data
The EMA monograph states that burdock root preparations should not be used during pregnancy and lactation due to insufficient data on safety. Some traditional sources cite concerns about potential uterine-stimulating activity, though this is not well documented for the root (it is more associated with the seed in older literature). Burdock root has a long history of dietary use in Japan (gobo) without reported adverse effects in pregnancy, but the medicinal dose exceeds typical culinary intake. Given the lack of specific safety data and the EMA's precautionary stance, use during pregnancy and lactation is not recommended without practitioner guidance. Topical use during pregnancy is likely safe but data are limited.
Adverse Effects
References
Monograph Sources
- [1] Blumenthal, M., Busse, W.R., Goldberg, A., et al.. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. American Botanical Council / Integrative Medicine Communications (1998) . ISBN: 978-0965555500
- [2] Committee on Herbal Medicinal Products (HMPC). Community Herbal Monograph on Arctium lappa L., radix (EMA/HMPC/246763/2009). European Medicines Agency (2011)
- [3] Committee on Herbal Medicinal Products (HMPC). Assessment Report on Arctium lappa L., radix (EMA/HMPC/246764/2009). European Medicines Agency (2011)
- [4] ESCOP (European Scientific Cooperative on Phytotherapy). ESCOP Monographs: Arctii radix (Burdock Root). ESCOP / Thieme (2016)
- [5] Hoffmann, D.. Medical Herbalism: The Science and Practice of Herbal Medicine. Healing Arts Press (2003) . ISBN: 978-0892817498
- [6] Mills, S., Bone, K.. Principles and Practice of Phytotherapy: Modern Herbal Medicine (2nd edition). Churchill Livingstone / Elsevier (2013) . ISBN: 978-0443069925
- [7] Gardner, Z., McGuffin, M. (eds.). American Herbal Products Association's Botanical Safety Handbook (2nd edition). CRC Press (2013) . ISBN: 978-1466516946
- [8] British Herbal Medicine Association. British Herbal Pharmacopoeia. BHMA (1983)
Clinical Studies
- [9] Maghsoumi-Norouzabad, L., Alipoor, B., Abed, R., et al.. Effects of Arctium lappa L. (Burdock) root tea on inflammatory status and oxidative stress in patients with knee osteoarthritis. International Journal of Rheumatic Diseases (2016) ; 19 : 255-261 . DOI: 10.1111/1756-185X.12477 . PMID: 25350500
- [10] Maghsoumi-Norouzabad, L., Alipoor, B., Abed, R., et al.. Effect of Arctium lappa linne (Burdock) root tea consumption on lipid profile and blood pressure in patients with knee osteoarthritis. Journal of Herbal Medicine (2019)
- [11] Chan, Y.S., Cheng, L.N., Wu, J.H., et al.. A review of the pharmacological effects of Arctium lappa (burdock). Inflammopharmacology (2011) ; 19 : 245-254 . DOI: 10.1007/s10787-010-0062-4 . PMID: 20981575
- [12] Gao, Q., Yang, M., Zuo, Z.. Overview of the anti-inflammatory effects, pharmacokinetic properties and clinical efficacies of arctigenin and arctiin from Arctium lappa L.. Acta Pharmacologica Sinica (2018) ; 39 : 787-801 . DOI: 10.1038/aps.2018.32
Traditional Texts
- [13] Felter, H.W.. The Eclectic Materia Medica, Pharmacology and Therapeutics. John K. Scudder (1922)
- [14] Felter, H.W., Lloyd, J.U.. King's American Dispensatory (18th edition, 3rd revision). Ohio Valley Company (1898)
Pharmacopeias & Reviews
- [15] Deutscher Arzneimittel-Codex (German Pharmaceutical Codex). DAC Monograph: Bardanae radix (Burdock Root). Govi-Verlag / ABDA (2008)
Last updated: 2026-03-02 | Status: review
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