bardana

Burdock (Arctium lappa L.): A Comprehensive Reference

1. Identity, Botanical Profile, and Common Forms

Taxonomy and Nomenclature

Arctium lappa L. is a medicinal edible homologous plant, commonly known as burdock or bardana, belonging to the family Asteraceae. It is also called gobō (牛蒡/ゴボウ), edible burdock, lappa, beggar's buttons, thorny burr, or happy major, and is a Eurasian species. The plant has several common names according to its origin: in China it is referred to as Niubang, in Japanese it is called gobo, and in Russia it is known as repejnik. In traditional Chinese medicine (TCM), the seeds are specifically designated niubangzi (牛蒡子). Latin synonyms recognized in the literature include Arctium majus BERNH., Lappa communis var. major, Lappa major GAERTN., Lappa officinalis ALL., and Lappa vulgaris HILL.

Botanical Description

Arctium lappa is a biennial plant, rather tall, reaching as much as 3 metres (10 feet). The fleshy taproot can grow up to 1 m long and 2 centimetres across. It has large, alternating, wavy-edged cordiform leaves that have a long petiole and are pubescent on the underside. The flowers are purple and grouped in globular capitula, united in clusters, appearing in mid-summer, from July to September. It is a shrub that grows to roughly 1 m in height, with roots that can extend to 45–50 cm in depth and 3–6 cm in diameter. These have a cylindrical outline, brown skin, and an interior which varies from white to yellowish-white depending on the age of the plant.

Distribution

Arctium lappa is widely distributed throughout Northern Asia, Europe, and North America and has been utilized for hundreds of years. It has become an invasive weed of high-nitrogen soils in North America, Australia, and other regions, but is cultivated for its vegetable root.

Plant Parts Used and Common Preparations

The roots, fruits, seeds, and leaves of A. lappa have been extensively used in traditional Chinese medicine (TCM). Dried burdock roots (Bardanae radix) are used in traditional medicine. In the regulatory context, the drug material is referred to as Arctii radix. Burdock is available as a fresh or dried root, tea, powder, or extract, and can be incorporated into food or drink. Burdock has been harnessed in various formulations such as tea, powder, and capsules.

As a food, the roots are edible cooked. They can be roasted or julienned and braised in soy sauce for use in stir fries and soups. Greater burdock root is widely eaten in Japan, Korea, and Taiwan. It was used in Europe during the Middle Ages as a vegetable, but now it is rarely used except in Italy and Portugal, where it is known as bardana or "garduna". The root was traditionally used in Britain as a flavouring in the herbal drink dandelion and burdock, which is still commercially produced.

Arctium tomentosum (woolly burdock) is used in folk medicine interchangeably with Arctium lappa and, according to the European Medicines Agency (EMA) monograph, provides an equal source of Arctii radix (Bardanae radix).

2. Traditional and Historical Use

Geographic and Cultural Reach

Burdock has been used therapeutically in Europe, North America, and Asia for hundreds of years. A. lappa roots have been used for hundreds of years as traditional medicines by multiple European, Asian, and North American cultures for a variety of purposes including to improve the immune system and enhance metabolism, as well as for its anti-inflammatory and anticancer effects.

Traditional Chinese Medicine (TCM)

Arctium lappa is classified as a perennial herb with a rich historical background and is widely recognized by the name burdock or bardana. It has been an integral part of traditional Chinese medicine for numerous centuries, with its roots, fruits, seeds, and leaves being utilized in a diverse array of medicinal applications. The seeds of greater burdock are employed in traditional Chinese medicine under the name niubangzi (牛蒡子). In the root, the active ingredients have been found to "detoxify" blood in terms of TCM and promote blood circulation to the skin surface, improving the skin quality and texture and curing skin diseases like eczema.

Japanese Use

In Japan, Arctium is known as gobo and has been used as food for about 1,000 years after Buddhist monks brought the plant into the country. They used the root to cure such things as constipation and mercury poisoning, and the leaves externally to heal rashes and burns.

European Use

In Europe during the World Wars, Arctium was used as a treatment for wounds. In folk medicine, mainly burdock roots, but also leaves and fruits, are used. The extracts from roots and leaves of burdock improve metabolism and diuretic action. They are used in catarrh of the gastrointestinal tract and to improve the liver and pancreas functions. In addition, they are recommended in the early stage of diabetes as a supportive means to maintain the proper level of glucose in the blood. Burdock leaves and roots are also used externally to relieve inflammation of the skin, such as pimples, boils, acne, and ulcers.

North American Use

Pilgrims brought A. lappa to North America and Native Americans quickly added the plant to their herbal repertoires for its blood-purifying abilities, as a kidney tonic, and also to increase concentration. It has also been historically used to treat hair loss.

Western Herbalism

In Western herbalism, burdock is considered an important alterative herb. It was used as a detoxifying agent to "cleanse" the blood, removing toxins from the body. It was used both internally and externally for many conditions of the skin, such as acne, boils, abscesses, and eczema.

Middle Eastern and Other Traditional Use

A. lappa is among commonly used traditional medicines in Iraq for treatment of diseases related to cancer or that may lead to cancer, such as skin diseases, blood-related diseases, inflammatory diseases, immune disorders, and infectious diseases.

Regulatory Recognition: EMA

The European Medicines Agency (EMA) recommends the roots of Arctium lappa as adjunct therapy for seborrheic skin conditions and urinary tract infections. The EMA has published a formal assessment report and community herbal monograph on Arctii radix (burdock root), classifying its use as a traditional herbal medicinal product based on its long history of use across Europe.

3. Key Constituents and Active Compounds

Overview of the Phytochemical Profile

Arctigenin, tannins, arctiin, caffeic acid, beta-eudesmol, inulin, trachelogenin-4, sitosterol-beta-D-glucopyranoside, diarctigenin, lappaol, and chlorogenic acid are major active ingredients isolated from Arctium lappa. The herb is rich in bioactive metabolites with therapeutic potential, encompassing polyphenolic antioxidants in its leaves, and flavonoids and fructo-oligosaccharides in its underground parts.

Lignans: Arctiin and Arctigenin

Among the major compounds, two important lignans present in the roots — arctigenin (ARG) and arctiin — are known to have anti-inflammatory, anti-allergic, anticancer, and anti-metastatic activities. Arctigenin is a compound extracted from seeds of Arctium lappa L. (Asteraceae), a Chinese, Japanese, and Korean medicinal herb. Arctiin is the glucoside precursor that is metabolized by gut bacteria to the biologically active aglycone arctigenin.

In extracts of burdock fruits, the presence of lignans was found: lappaol A, lappaol C, lappaol F, matairesinol, arctiin, arctigenin, and arctigenic acid. A burdock fruit contains approximately 7% of arctiin, which is classified as a lignan glycoside, and approximately 0.6% of arctigenin, which is an aglycone of arctiin.

Fructooligosaccharides: Inulin

Inulin is one of the most quantitatively significant constituents of burdock root. Burdock root extracts are rich in phenolic acids — primarily dicaffeoylquinic acid isomers and their derivatives. They are also a rich source of polysaccharides, mainly inulin, phenolics, and polyacetylenes, and derivatives of unsaturated fatty acids — linoleate and oleate. From the water fraction, an inulin-type fructan with a degree of polymerization of 20–24 has been isolated, with promising functional properties. This has demonstrated potential prebiotic effects.

Phenolic Acids and Caffeoylquinic Acid Derivatives

The main compounds of burdock extracts are caffeoylquinic acid derivatives, lignans (mainly arctiin), and various flavonoids. The occurrence of some phenolic acids (caffeic acid, chlorogenic acid, and cynarin) in burdock seeds; arctiin, luteolin, and quercetin rhamnoside in burdock roots; and phenolic acids, quercetin, quercitrin, and luteolin in burdock leaves has been reported.

Other Constituents

The main biologically active substances in burdock roots comprise volatile compounds, tannin, β-eudesmol, caffeic acid, chlorogenic acid, inulin, trachelogenin, sitosterol-β-D-glucopyranoside, lappaol, terpenes, polyynes, arctiin, arctigenin, and diarctigenin. In extracts of burdock leaves, arctiin and arctigenin from the group of lignans, onopordopicrin from the group of sesquiterpene lactones, and also flavonoids — luteolin, quercetin, quercitrin, and rutin — and phenolic acids were found. Additionally, A. lappa is replete with vital vitamins, an assortment of minerals, and indispensable amino acids essential for bodily functions.

4. Mechanisms of Action

Anti-Inflammatory Mechanisms

Arctigenin is thought to have anti-tumor and anti-inflammatory properties by preventing Nuclear factor-κB (NF-κB) from translocating to the nucleus. Arctigenin, a phenylpropanoid dibenzylbutyrolactone lignan, potently inhibits iNOS expression and NO production through suppression of NF-κB activation and inhibition of IκBα phosphorylation and p65 nuclear translocation in LPS-activated macrophages, also acting on COX-2 mRNA. Burdock leaf extracts have shown a modulatory effect on the complement system, which plays an important role in the development of inflammatory diseases, with an inhibitory effect on all complement pathways.

Diarctigenin, a lignan constituent from Arctium lappa, has been shown to down-regulate zymosan-induced transcription of inflammatory genes through suppression of the DNA binding ability of Nuclear Factor-κB in macrophages (J Pharmacol Exp Ther 2008; 327(2): 393–401).

Antidiabetic and Metabolic Mechanisms

Available evidence suggests that A. lappa exerts antidiabetic effects via multi-layered mechanisms, including AMPK activation, insulin signaling modulation, and increased GLUT4 translocation. Key bioactives — arctigenin, arctiin, and inulin — collectively improve insulin sensitivity and lipid metabolism. Mechanistic studies show that the lignans arctigenin and arctiin are also involved in the inhibition of α-glucosidase and can alter the conformation of the enzyme, acting as non-competitive inhibitors. Chlorogenic and cynaric acids are assumed to bind to the active center of the enzyme through hydrogen bonds, preventing the breakdown of oligosaccharides.

Sitosterol-beta-D-glucopyranoside is considered to be among the most potent substances among the large profile of active compounds found in the root of burdock. It has demonstrated potent inhibitory effects on alpha-glucosidase activities. Alpha-glucosidases are involved in the processing of glycoprotein and glycogenolysis. Inhibitors of glycosidase are potential therapeutic agents in treating diabetes mellitus and obesity.

Hepatoprotective Mechanisms

In animal studies, A. lappa suppressed SGOT and SGPT elevations induced by CCl₄ or acetaminophen in a dose-dependent manner and alleviated the severity of liver damage. To elucidate possible mechanisms, glutathione (GSH), cytochrome P-450, and malondialdehyde (MDA) contents were studied. A. lappa reversed the decrease in GSH and P-450 induced by CCl₄ and acetaminophen, and decreased MDA content in intoxicated mice. These results suggested that A. lappa could protect liver cells from damage, perhaps by its antioxidative effect on hepatocytes.

Anticancer Mechanisms

Lappaol F was shown to induce G(1) and G(2) cell-cycle arrest, induce cell death in several cancer cell lines, and to activate caspases. In human hepatocellular carcinoma (HCC) cell lines, arctigenin treatment inhibited cell growth in both HepG2 and Hep3B cell lines (IC₅₀ of 4.74 nM for HepG2 cells and 59.27 nM for Hep3B cells). Migration, invasion, and colony formation by HepG2 cells were significantly inhibited by arctigenin. Arctigenin also significantly reduced the levels of gankyrin mRNA and protein in HepG2 cells, with a luciferase assay indicating it targeted the −450 to −400 region of the gankyrin promoter.

Arctigenin and arctiin, along with lignans matairesinol, (iso)lappaol A, lappaol C, and lappaol F, were shown to up-regulate the expression of Jun-N-terminal kinase-1 (JNK-1) and promote longevity and stress resistance in the roundworm Caenorhabditis elegans via the JNK-1–DAF-16 cascade.

Gastroprotective Mechanisms

The alcoholic extraction derived from the root of the burdock plant exhibits a noteworthy anti-secretory effect through the partial suppression of H⁺/K⁺-ATPase activity. Root extracts also demonstrated gastroprotective activity and neuroprotective effects due to several monocaffeoylquinic acids and dicaffeoylquinic acids.

5. Scientific Evidence by Area of Use

5.1 Inflammation and Oxidative Stress

Human / Clinical Evidence

A study was designed to examine the effect of burdock root tea on inflammatory markers and oxidative stress indicators in patients with knee osteoarthritis (OA). Thirty-six patients (10 men and 26 women) aged 50–70 years with knee osteoarthritis were selected and randomly divided into two groups. The results showed that burdock root tea significantly decreased the levels of serum IL-6 (P = 0.002), hs-CRP (P = 0.003), and malondialdehyde (P < 0.001), while the levels of serum total antioxidant capacity (TAC) (P < 0.001) and activities of SOD (P = 0.009) were significantly increased. GPX activities increased but not significantly. The results suggested that Arctium lappa root tea improves inflammatory status and oxidative stress in patients with knee osteoarthritis. This study was published in the International Journal of Rheumatic Diseases (2016, 19:255–61).

A related clinical trial by Alipoor et al. (2014) in Current Topics in Nutraceutical Research assessed the effect of burdock root tea on clinical signs and symptoms. The Knee Injury and Osteoarthritis Outcome Score (KOOS) questionnaire, Timed Up and Go (TUG), and Visual Analog Scale (VAS) tests were used for clinical assessments. There was significant difference in pain intensity (P < 0.001), scores of the KOOS questionnaire (P = 0.020), and TUG (P = 0.027) between the two groups after treatment. Significant reduction in pain intensity, significant decrease in mean TUG score, and significant increase in mean KOOS score were noted in the burdock root tea group. The dose used in the inflammation/OA trials was burdock root tea at 6 g/day for 6 weeks.

Evidence assessment: Most of the research on burdock root has been done in test tubes and on animals. A small number of human studies show that it decreases inflammation. The osteoarthritis trials are small (36 participants), single-center, and of short duration, limiting generalizability. Larger, double-blind, placebo-controlled trials are needed.

5.2 Diabetes and Blood Glucose Regulation

Preclinical Evidence

Animal studies indicate that burdock extract induces hypoglycemia and increases carbohydrate tolerance. The root extract displays properties such as antidiabetic and hypolipidemic pharmacological actions. The available evidence suggests that A. lappa exerts antidiabetic effects via multi-layered mechanisms, including AMPK activation, insulin signaling modulation, and increased GLUT4 translocation. Key bioactives (arctigenin, arctiin, and inulin) collectively improve insulin sensitivity and lipid metabolism. However, preclinical studies confirm these effects in animal models, while limited clinical data in non-diabetic cohorts focus on systemic inflammation.

Human Evidence

Early research suggests that eating batter prepared from dried burdock root together with butter, water, salt, artificial sweetener, and ginger extract prevents a spike in blood sugar after eating in people with diabetes. This research includes no large-scale human clinical trials, so it is unclear if burdock can have the same effect in real cases of diabetes.

Evidence assessment: Antidiabetic evidence is largely preclinical (animal and in vitro). Preclinical studies confirm these effects in animal models, while limited clinical data in non-diabetic cohorts focus on systemic inflammation. This highlights a significant gap in randomized controlled trials targeting glycemic control in diabetic populations.

5.3 Liver Protection (Hepatoprotection)

Preclinical Evidence

Pharmacological studies have indicated that burdock roots have hepatoprotective, anti-inflammatory, free radical scavenging, and antiproliferative activities. The utilization of Arctium lappa root extract has exhibited encouraging outcomes in addressing hepatotoxicity induced by cadmium, lead, chromium, and acetaminophen, ameliorating liver damage and oxidative stress. Burdock also exhibits hepatoprotective effects in rats due to its antioxidative activity.

Evidence assessment: Hepatoprotection evidence is currently limited to animal and in vitro models; no human clinical trials have been identified specifically testing burdock for liver disease endpoints.

5.4 Cancer — Anticancer Activity

In Vitro and Animal Evidence

The crude extract of A. lappa shows antitumor activity in human liver carcinoma (HepG2), lung cancer (A549), and stomach cancer cells (KATO III). Testing in prostate-cancer cells revealed that the methanol extract of burdock seeds showed activity against the LNCaP cell line. Bioassay-guided cytotoxicity fractionation isolated the compounds lappaol A, C, and F, arctignan E, and arctiin. Lappaols A, C, and F showed activity, with IC₅₀ values of 8, 16, and 40 μg/mL, respectively.

Phase I Human Clinical Trial

Since several bodies of evidence confirmed vigorous anti-tumor effects of arctigenin, researchers conducted a phase I clinical trial involving 15 advanced pancreatic cancer patients refractory to gemcitabine. GBS-01 (an extract rich in arctigenin from the fruit of Arctium lappa L.) was prescribed orally at escalating doses from 3 g to 12 g. An open-label, single institutional, phase I study suggested that a daily dose of 12 g of GBS-01, containing approximately 4 g burdock fruit extract rich in arctigenin, may be clinically safe and may have possible benefits in patients with advanced pancreatic cancer refractory to gemcitabine therapy. However, well-defined large-scale trials are required to establish these findings.

Early research suggests that using a specific product containing burdock root, sheep sorrel, slippery elm bark, and rhubarb (Essiac) does not improve quality of life in people with breast cancer.

Evidence assessment: Research has found that burdock has "potent inhibitory effects" on cancer growth, including pancreatic carcinoma, in rats. Another study found burdock root significantly reduced tumor growth in mice with melanoma. While this sounds promising, these studies involved animals rather than humans. Burdock root is not currently recommended for the prevention or treatment of cancer. The Phase I pancreatic cancer trial, while notable, enrolled only 15 patients and was open-label without a control arm, making efficacy conclusions impossible at this stage.

5.5 Gastrointestinal Health

Burdock has been discovered to possess diverse therapeutic advantages, such as the facilitation of gastrointestinal mucosal mending in patients afflicted with ulcers. Several studies have shown that the burdock complex (a composite including burdock, angelica, gromwell, and sesame oil) can inhibit the adhesion of Helicobacter pylori to gastric epithelial cells and reduce levels of inflammatory markers. The consumption of burdock complex by subjects infected with Helicobacter pylori resulted in enhanced antioxidant capacity, decreased urea breath test values, and diminished inflammatory markers, indicating a potential remedial effect on ulcers. The research encompasses in vitro analyses on AGS cells and a clinical trial involving subjects with Helicobacter pylori infection.

A randomized controlled trial (RCT) found that oral administration of burdock root tea (1.5 g) three times per day decreased the recurrence rate of acute colonic diverticulitis (ACD) by 20% compared to the control group.

Evidence assessment: The H. pylori study used a burdock-containing complex rather than burdock alone, making it impossible to attribute effects solely to A. lappa. The diverticulitis RCT represents a promising but preliminary finding that requires replication in larger trials.

5.6 Prebiotic and Gut Microbiome Effects

Generally, studies have shown that short-term inulin supplementation may have a blood lipid-lowering effect in humans. In contrast, no significant beneficial effect of early-life inulin supplementation on blood lipids in healthy humans was observed in one study. Burdock root inulin has been investigated extensively in its prebiotic effect; however, studies related to the effects of early-life burdock root inulin intervention as daily diet are scarce.

Evidence assessment: Prebiotic benefits from burdock-derived inulin are biologically plausible and supported by the broader inulin literature, but studies using burdock specifically as the inulin source in humans are limited.

5.7 Antimicrobial Activity

There are restrictive effects of chlorogenic acid isolated from burdock leaves on E. coli, S. aureus, and Micrococcus luteus. Burdock root and chlorogenic acid have also demonstrated antibiofilm and anti-β-lactamase activities against Klebsiella pneumoniae in vitro.

Evidence assessment: Antimicrobial activity has been demonstrated exclusively in vitro. No human clinical trials addressing infectious disease endpoints with burdock have been identified.

5.8 Skin Health

This fruit extract is important in reducing wrinkles in vivo. Arctiin had the highest activity in terms of procollagen and MMP-1 inhibition, which helps in the treatment of wrinkles. It helps in the regeneration of dermal matrix, offering treatment for aging.

Burdock root has traditionally been used to treat a variety of skin conditions. It has anti-inflammatory and antibacterial properties that could protect against skin infections and promote skin healing. However, there have been very few clinical trials testing whether burdock can reliably treat any skin condition.

Evidence assessment: Skin health benefits remain largely preclinical and traditional. Dermal applications and anti-aging effects of arctiin have been demonstrated in laboratory settings but are not validated by robust human trials.

6. Body Systems and Health Areas

Based on the reviewed literature, Arctium lappa has been associated with the following body systems and areas:

• Immune/Inflammatory System: Antimicrobial, anti-inflammatory, and anti-allergic activities demonstrated in vitro and in vivo.
• Metabolic/Endocrine System: Traditionally used in Eastern and European medicine to address metabolic disorders. Antidiabetic and hypolipidemic effects shown in preclinical models.
• Hepatic System: Hepatoprotective, free radical scavenging, and antiproliferative activities demonstrated in pharmacological studies.
• Gastrointestinal System: Extracts from roots and leaves improve metabolism and diuretic action, and are used in catarrh of the gastrointestinal tract and to improve liver and pancreas functions.
• Musculoskeletal System: Clinical evidence in knee osteoarthritis for reduced inflammatory markers and improved functional outcomes.
• Oncology: Burdock fruits are used in traditional medicine as an aid in the treatment of cancer, with preliminary human trial data for arctigenin in pancreatic cancer.
• Skin/Integumentary System: Historical and ongoing use for eczema, acne, boils, and wound healing.
• Renal/Urinary System: Traditional use as a diuretic, recognized by the EMA for use in urinary tract conditions.
• Nervous System: The root extract displays anti-Alzheimer and various other neuroprotective pharmacological actions in preclinical models.
• Gut Microbiome: Inulin content supports prebiotic effects and modulation of the gut microbiota.

7. Dosage Forms and Reported Dosages

The following dosages and forms appear in the reviewed literature. These are reported as they appear in the sources and do not represent clinical recommendations.

• Dried root (oral): 2 to 6 g, three times daily.
• Liquid extract (1:1 in 25% alcohol): 2 to 8 mL, three times daily.
• Tincture (1:10 in 45% alcohol): 8 to 12 mL, three times daily.
• Root tea (clinical OA trials): 6 g/day for 6 weeks, significantly reducing inflammatory markers IL-6 (P = 0.002) and hs-CRP (P = 0.003) in patients with knee osteoarthritis.
• Burdock root tea (diverticulitis RCT): 1.5 g taken three times per day.
• GBS-01 (arctigenin-rich fruit extract, phase I cancer trial): A daily dose of 12 g of GBS-01, containing approximately 4 g burdock fruit extract rich in arctigenin, at escalating doses explored in a phase I study.

No significant gastrointestinal adverse effects were reported in clinical trials using burdock root tea at doses of 6 g daily.

8. Safety Considerations and Interactions

General Safety Profile

Burdock is generally considered a safe and edible food product; research reveals limited information regarding its toxicity. Burdock root is commonly eaten as a food by Japanese people living all over the world, including in Canada and the United States. It is listed as a GRAS food (generally recognized as safe) in the United States and Canada.

Atropine Contamination — A Documented Risk

Cases of apparent burdock toxicity have required clarification: burdock root normally does not contain any atropine-like alkaloids. The cases described patients who, after ingesting a commercially prepared burdock root tea, had anticholinergic symptoms that cleared with physostigmine salicylate treatment. The FDA confirmed the presence of atropine at 30 mg/g in a commercial preparation of burdock root tea. In one instance, anticholinergic poisoning was reported upon oral consumption of A. lappa extract; however, this poisoning later turned out to be caused by products that had been contaminated with root of belladonna (deadly nightshade), which contains the poisonous chemical atropine. Contamination with Atropa belladonna root has been mentioned by the EMA, as well as exchanges with Symphytum officinale L. and Rumex obtusifolius L. Contamination or adulteration of Arctium lappa root with serious health risks are possible and need to be excluded by adequate quality control.

Allergic Reactions

There are very few side effects due to root preparations. The main risks are allergic reactions associated with sesquiterpene-lactones. There is one case of an anaphylactic reaction after eating boiled burdock. Contact dermatitis might develop after several days of applying a burdock root plaster to a wound, or even as fast as within 12 hours in some cases. Allergic reactions have been demonstrated in people who are sensitive to the Asteraceae/Compositae family. Other members of this family include chrysanthemum, daisy, marigold, and ragweed.

Drug Interactions

• Antidiabetic agents and insulin: Burdock may increase hypoglycemic effects when combined with insulin or oral antidiabetic drugs. Burdock may enhance the hypoglycemic effect of hypoglycemia-associated agents.
• Soluble fiber effects on drug absorption: As with other sources of soluble fibre, burdock root itself may reduce the absorption of oral medications and therefore should be taken separately from these.
• Anticoagulants/antiplatelets: Enhanced bleeding risk due to burdock's reported blood circulation effects has been noted, with antidiabetic agents requiring dose adjustment due to additive hypoglycemic effects.
• Potassium-sparing considerations: Burdock can be used safely except for those who are on potassium-lowering diuretic therapy, as it contains fairly high quantities of potassium.

Pregnancy and Lactation

Burdock is contraindicated during pregnancy — especially in the first trimester — because of the effects of anthraquinone glycosides found in the roots of burdock plants. Burdock should be avoided during pregnancy due to insufficient safety data. Traditional use suggests potential uterine stimulant effects, though this has not been definitively established in humans. Safety during breastfeeding has not been established. Animal studies indicate that burdock extract stimulates uterine smooth muscle.

No Documented Overdose from Root Preparations

No overdoses with root preparations have been reported. Reproductive toxicity and genotoxicity were tested with non-specified preparations or plant parts other than the root.

References

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