Pharmacognosy · Phytomedicine

Dandelion

Taraxacum officinale Weber — A ubiquitous perennial herb whose root and leaf deliver clinically validated diuretic, hepatoprotective, choleretic, anti-inflammatory, and antioxidant actions through a rich profile of inulin, sesquiterpene lactones, triterpene alcohols, and flavonoids.

35 Primary Refs
18+ Properties
Root Parts Used
✦ Researched
Last Updated
Primary Source Wikiphyto · NCBI PubMed
Family Asteraceae
Researched ✦ · Asteraceae family

Biological Overview

Taraxacum officinale is a remarkably versatile perennial herb whose entire plant is pharmacologically active. Its root, leaf, and flowers each contribute distinct bioactive fractions — from inulin and sesquiterpene lactones in the root to potassium-rich flavonoid profiles in the leaf and powerful antioxidant flower extracts — making it one of the most comprehensively documented European medicinal plants.

Key ActivesInulin, Taraxasterol, Sesquiterpene Lactones
Primary TargetsLiver, Kidney, Immune, Metabolic
Key MechanismPhase II enzyme induction · CYP modulation
PharmacopoeiaFrench Pharmacopoeia — Liste A
Botanical Classification

Taxonomy & Identification

Latin Name
Taraxacum campylodes G.E. Haglund
Synonym(s)
Taraxacum officinale Weber; T. dens leonis Desf.
Family
Asteraceae
Common Names
Dandelion, Pissenlit, Dent-de-lion
English Name
Dandelion
Parts Used
Root (autumn), Leaf (spring)
Origin
Europe; naturalised worldwide
Etymology
dens leonis (Lat. lion's tooth) — leaf shape
Morphology & Distribution

Description & Habitat

Dandelion is a hardy perennial herb with a stout taproot, growing as a rosette of deeply lobed, triangular-toothed leaves directly from ground level. The leaves are basal, disposed in a rosette, and profoundly divided into unequal triangular and hooked lobes — the "lion's teeth" that give the plant its common name.

Hollow, leafless stems bear solitary golden-yellow capitula composed entirely of ligulate florets. The mature fruit is a cypsela (achene) crowned with fine, silky pappus bristles forming the familiar spherical "clock" — an efficient anemochorous dispersal mechanism.

Dandelion thrives in meadows, damp fields, roadsides, and disturbed ground across the temperate Northern Hemisphere. Its deep taproot allows it to exploit heavy soils and survive conditions inhospitable to shallower-rooted plants.

Morphological Profile

Habit
Perennial herbaceous, deep taproot
Leaves
Basal rosette, deeply pinnate-lobed
Stems
Hollow, leafless, milky sap
Flower Head
Solitary capitulum, all ligulate
Florets
Golden-yellow, 100–300 per capitulum
Fruit
Achene with silky pappus
Root
Stout taproot, white latex
Ethnobotany & Traditional Use

History & Tradition

Folk Medicine

Culinary & Depurative Use

Young leaves have historically been used in spring salads across Europe — valued both for their nutritional content and their bitter "blood-cleansing" properties. Spring and autumn detox cures featuring dandelion root decoction were standard in European domestic medicine for centuries.

Paradox of Tradition

Enuresis & the Diuretic

A notable traditional paradox: dandelion was used in folk medicine for nocturnal enuresis (bed-wetting) — despite its well-established diuretic effect. This reflects empirical observation of a tonifying effect on bladder function distinct from its diuretic action on the kidney.

Homeopathy

Homoeopathic Indications

In homoeopathic tradition, Taraxacum is indicated for the characteristic "mapped tongue" (lingua geographica — depapillated in patches), and for jaundice or subicterus. Popular medicine also used it for anaemia and "purifying the blood," reflecting its iron and mineral content.

Therapeutic Material

Parts Used & Available Formulations

🌱

Root (Autumn Harvest)

The primary pharmacopoeial part, harvested in autumn when inulin content peaks at up to 40% and protein reserves are highest. Listed in the French Pharmacopoeia Liste A. Used as decoction, EPS (standardised plant extract), dry extract, or fluid extract for hepatic, renal, and metabolic indications.

🍃

Leaf (Spring Harvest)

Harvested in spring when fructose and vitamin C content are highest. The leaf is richer in potassium and flavonoids than the root, and is the primary part evaluated in clinical diuresis studies. Used fresh in salads, as infusion, or in mother tincture of the whole plant.

🌼

Flowers

Powerfully antioxidant against reactive oxygen species and nitric oxide in vitro. [31][32] Primarily of interest in food and nutraceutical applications rather than standard phytotherapy.

Available Galenical Forms

Mother Tincture (Whole Plant) Hydroalcoholic tincture of the whole fresh plant. Broad-spectrum preparation used in integrative medicine.
Oral
EPS — Root Standardised plant extract (EPS) of the root; concentrated and standardised form preferred clinically.
Oral
Dry Extract Concentrated dry extract; used in capsule formulations for convenient dosing.
Capsule
Fluid Extract Standardised liquid extract for compound preparations and licensed herbal products.
Oral
Various Specialities Combined hepatic and renal support preparations; detox blends; tablet and capsule forms.
Varied
Clinical Dosing

Usual Dosages

Traditional and pharmacopoeial dosing for root decoction and infusion. Discontinuous courses recommended for all draining/detox applications.

Formulation Dose Frequency Indication / Notes
Infusion (leaf or aerial part) 4–10 g dried drug 3× daily Diuretic; digestive stimulation
Root decoction 30 g root per litre water 1 litre/day Boil briefly, infuse 30 min. 10 days/month in discontinuous courses
Root decoction (simplified) 2 tablespoons per litre 1 litre/day Hepatic drainage; discontinuous cures
Biochemical Profile

Composition

The root and leaf differ markedly in their seasonal phytochemical profiles. Inulin dominates the autumn root; fructose and vitamins peak in spring leaves.

Root & Whole Plant

Inulin Up to 40% in autumn root with reserve proteins; up to 18% fructose in spring. [1] Osmotic diuretic; prebiotic substrate.
Up to 40%
Sesquiterpene Lactones ("Taraxacin") Germacranolides (taraxinic acid glucopyranoside, taraxacoside) and eudesmanolides. Bitter principles responsible for hepatic enzyme stimulation. [2][3][4]
Bitter
Pentacyclic Triterpene Alcohols Taraxasterol (= alpha-lactucérol), pseudotaraxasterol, arnidiol, faradiol, beta-amyrin, cycloartenol. Anti-inflammatory via taraxasterol.
Anti-inflam.
Flavonoids Luteolin glucoside (luteoloside), cosmoside, apigenin glucosides, quercetin glucosides, luteolin rutinoside. [2][3]
30+ cpds
Phenolic Acids Caffeic acid, p-coumaric acid, ferulic acid, protocatechuic acid, chicoric acid, caffeoylquinic acid isomers. [2][3][4]
Antioxidant
Coumarins Scopoletin, esculetin, umbelliferone.
Secondary
Sterols Sitosterol, stigmasterol, taraxasterol, pseudotaraxasterol.
Membrane
β-Fructofuranosidases Produce fructo-oligosaccharides with prebiotic activity. [5]
Prebiotic
Potassium 4.5% in whole plant; 2.5% in root. High potassium compensates urinary losses during diuresis — a self-buffering mechanism unique among plant diuretics.
4.5%
Vitamins (Leaf) Vitamin C and beta-carotene highest in spring leaves. Heavy metal content of leaves is highly region-dependent. [6]
Leaf only
Inulin — Osmotic Diuretic

Filtered by the renal glomerulus, inulin increases tubular osmotic pressure and is not reabsorbed, producing diuresis without electrolyte depletion — an osmotic mechanism analogous to mannitol.

Sesquiterpene Lactones — Hepatic Stimulation

The bitter principles (formerly taraxacin) stimulate Phase II detoxification enzymes including UDP-glucuronosyl transferase — with a 244% increase documented in rat models.

Taraxasterol — Anti-inflammatory

Pentacyclic triterpene alcohol with documented in vivo anti-inflammatory activity in animal models and modulatory effect on skeletal muscle cell viability and inflammatory response.

Plant Properties — Pharmacodynamics

Whole-plant biological activities with primary literature citations

18+ Properties French Pharmacopoeia EMA Assessed

Choleretic & Cholagogue

Stimulates bile production (choleretic) and promotes bile flow into the duodenum (cholagogue). A foundational hepatic action underlying dandelion's use in cholecystopathy, lipid digestion insufficiency, and digestive bitters formulations.

Diuretic

Human study confirms significant increase in urinary frequency and volume from a single-day leaf extract. [7] Effect linked to high potassium content [8] and osmotic action of inulin in the renal tubule.

Anti-urolithiatic

Active against urinary calculi composed of whewellite (calcium oxalate monohydrate). Identified among globally used anti-urolithiatic plants of the Asteraceae family. [9]

Anti-obesity & Lipase Inhibition

Dandelion extract induces measurable weight loss and inhibits pancreatic lipase in vitro and in vivo — a mechanism shared with the pharmaceutical anti-obesity agent orlistat. [10][11]

Laxative, Prebiotic & Depurative

Mild laxative effect via gut motility stimulation. Inulin acts as a prebiotic substrate for beneficial colonic bacteria. Traditional "depurative" (blood-purifying) use substantiated by Phase II enzyme induction.

Detoxifying — Phase II Induction

Remarkable 244% increase in UDP-glucuronosyl transferase activity documented in rats receiving dandelion. [12] Supports use in detox cures and as adjunct during prolonged medical treatments.

Hypolipidaemic & Antioxidant

Root and leaf extracts reduce total cholesterol and LDL while increasing HDL in cholesterol-fed rabbits. Protects against oxidative stress implicated in atherosclerosis. [13]

Hepatoprotective

Documented hepatoprotective activity across multiple experimental models. Dandelion is classified as a hepatoprotective herb with significant therapeutic potential. [14]

Anti-inflammatory

Taraxasterol shows significant in vivo anti-inflammatory activity in animal inflammation models. [15] Anti-inflammatory and antalgic effects on skeletal muscle. [17] Also inhibits COX-2-mediated NO production and prostaglandin synthesis. [25]

Antioxidant

Diverse antioxidant activity documented across plant fractions. Flowers are powerfully antioxidant against reactive oxygen species and nitric oxide. [16][31][32]

Anti-hyperglycaemic & Anticoagulant

Comprehensive phytochemical and pharmacological review documents anti-hyperglycaemic and anticoagulant effects. [18] Moderate antidiabetic activity confirmed separately. [28]

Immunostimulant

Fractions from T. officinale induce neutrophil migration, splenic lymphocyte proliferation, and phagocytosis. [19] Also stimulates inducible nitric oxide synthase (iNOS) and NO production in peritoneal macrophages. [20]

Antineoplastic

Cytotoxic activity on Hep G2 hepatocellular carcinoma cells via TNF-alpha and IL-1alpha secretion. [23] Antiproliferative and invasive activity against breast and prostate cancer cells. [24] Lupeol induces differentiation in melanoma cells. [22]

Anti-angiogenic & Anti-nociceptive

Anti-angiogenic, anti-inflammatory, and antinociceptive activity via inhibition of NO production and COX-2 expression. [25] Restores NO and TNF-alpha production by IFN-gamma-primed macrophages. [26]

Anti-anaemic

Hydroalcoholic extract increases erythrocyte count and haemoglobin levels in mice — substantiating the traditional folk use for anaemia and "blood purification." [27]

Pancreatoprotective

Taraxacum officinale protects against cholecystokinin-induced acute pancreatitis in rats, suggesting a protective role in pancreatic inflammatory disease. [29]

Anti-HIV (Preliminary)

Aqueous dandelion extract inhibits HIV-1 replication and reverse transcriptase activity in vitro — preliminary findings with promising implications for antiviral research. [30]

Orexigenic & Eupeptic

Increases gastric secretion, stimulates appetite, and improves digestion of fats via choleretic activity. Classified as an orexigenic bitter in European phytotherapy traditions.

Clinical Use

Clinical Indications

Indications span hepatic, renal, metabolic, oncological, and immunological domains, supported by pharmacopoeial status, clinical studies, and extensive preclinical documentation.

🫀
Hepatic & Biliary
Phytotherapy — Root / Whole Plant
  • Cholecystopathy & biliary insufficiency — Choleretic/cholagogue action supports bile production and drainage.
  • Hepatic enzymatic stimulation — Phase II enzyme induction (UDP-glucuronosyl transferase +244%). [12]
  • Hepatoprotection — Documented protective activity in experimental liver injury models. [14]
  • Adjunct during heavy/prolonged treatments — Chemotherapy support with attention to CYP450 interactions; therapeutic windows required.
  • Spring and autumn detox cures — Traditional discontinuous "draining" cures for seasonal liver and kidney support.
  • Prevention of biliary lithiasis — Via choleretic and cholesterol-modulating activity.
💧
Renal & Urinary
Phytotherapy — Leaf / Root
  • Diuresis — Clinically documented increase in urination frequency and volume from leaf extract (human study). [7]
  • Urinary lithiasis (whewellite calculi) — Anti-urolithiatic activity against calcium oxalate monohydrate stones. [9]
  • Renal enzymatic stimulation — Sesquiterpene lactones stimulate renal detoxification enzyme pathways.
  • Gout — Depurative action on urate metabolism; traditional and plausible via diuretic and antioxidant mechanisms.
  • Hypertension (adjunct) — Mild diuretic action may support blood pressure management in suitable candidates.
⚖️
Metabolic & Cardiovascular
Phytotherapy — Whole Plant
  • Atherosclerosis, type 2 diabetes, metabolic syndrome — Hypolipidaemic, antioxidant, anti-hyperglycaemic properties with pharmacological basis. [33]
  • Obesity — Pancreatic lipase inhibition reducing dietary fat absorption. [11]
  • Hypolipidaemia — Reduction of total cholesterol and LDL; increase in HDL in animal models. [13]
  • Diabetes (moderate antidiabetic activity) — Reviewed for physiological effects on type 2 diabetes parameters. [28]
🌿
Dermatological, Immune & Other
Phytotherapy — Whole Plant
  • Eczema & skin disease — Traditional depurative and anti-inflammatory basis; supported by antioxidant and immunomodulatory mechanisms.
  • Rheumatic diseases & gout — Anti-inflammatory (taraxasterol), antioxidant, and diuretic synergy.
  • Immunostimulation — Indicated in states of immune depression; induces neutrophil migration and macrophage activation. [19]
  • Anaemia — Traditional and experimentally supported via increase in erythrocytes and haemoglobin. [27]
  • Pancreatic protection — Experimental evidence for acute pancreatitis protection. [29]
Pharmacology

Known & Presumed Mode of Action

💧

Osmotic Diuresis — Inulin

Inulin is filtered by the renal glomerulus and is not reabsorbed by the tubule. It increases tubular osmotic pressure, producing diuresis without sodium loss — an osmotic mechanism analogous to mannitol. High potassium content simultaneously compensates urinary potassium excretion. [7][8]

🔬

Phase II Enzyme Induction — Sesquiterpene Lactones

The sesquiterpene lactones ("bitter principles" / taraxacin) stimulate hepatic and renal enzyme pathways. UDP-glucuronosyl transferase activity increases by 244% in rats receiving dandelion — a dramatic Phase II detoxification induction supporting hepatoprotective and carcinogen-neutralising activity. [12]

🔥

COX-2 Inhibition & NO Suppression

Anti-inflammatory and anti-angiogenic activity operates via inhibition of NO production and COX-2 expression in macrophages and endothelial cells. Taraxasterol contributes to systemic anti-inflammatory activity in vivo through prostaglandin and leukotriene pathway modulation. [25]

⚙️

Pancreatic Lipase Inhibition

Dandelion extracts inhibit pancreatic lipase — the enzyme responsible for dietary fat digestion and absorption — both in vitro and in vivo. This mechanism, shared with the pharmaceutical agent orlistat, reduces fat absorption and underlies the anti-obesity activity. [11]

🧬

Immunomodulation — iNOS & Macrophage Activation

Dandelion activates inducible nitric oxide synthase (iNOS) in mouse peritoneal macrophages, induces neutrophil migration, promotes splenic lymphocyte proliferation, and enhances phagocytosis — a broad immunostimulatory profile. [19][20]

🛡️

CYP450 Modulation

Dandelion decreases CYP1A2 and CYP2E activity in hepatic microsomes of rats; no significant alteration of CYP2D or CYP3A activity. This selective CYP inhibition is clinically relevant for patients on medications metabolised primarily by CYP1A2, and necessitates therapeutic windows during prolonged treatment courses.

Preparation Guide & Legal Status

Formulations & Regulation

Common Formulations

01

Root Decoction

Two tablespoons of dandelion root (Taraxacum dens leonis) per litre of water. Boil briefly, infuse 30 minutes. Drink one litre per day for 10 days per month. Classic discontinuous draining cure for hepatic and renal support.

02

Mother Tincture (Whole Plant)

Hydroalcoholic tincture of the whole fresh plant. Standard preparation for integrative practitioners; covers both leaf and root fractions in a single galenical form.

03

EPS Root (Standardised Plant Extract)

Concentrated, standardised extract of root. Preferred clinical form for consistent dosing in metabolic, hepatic, and renal indications.

04

Leaf Infusion

4–10 g of dried leaf per cup, infused 10 minutes. 3 cups daily for diuretic and eupeptic indications. Spring harvest material preferred.

Regulatory Status

French Pharmacopoeia — Liste A

The root, leaf, and aerial part of Taraxacum officinale are listed in the French Pharmacopoeia, Liste A, confirming established medicinal use and accepted quality standards in France.

EMA/HMPC — Assessment Report

The European Medicines Agency's Committee on Herbal Medicinal Products (HMPC) has issued an assessment report for Taraxacum officinale root with herb (radix cum herba), published November 2009 (EMA/HMPC/212897/2008), establishing traditional use recognition across EU member states. [35]

Dietary Supplement Status (US & Global)

Dandelion root and leaf extracts are widely available as dietary supplements under DSHEA (USA) and equivalent frameworks globally. Product quality varies substantially; consumers should seek third-party tested preparations with verified inulin and/or sesquiterpene lactone content.

CYP450 Caution — Drug Interactions

Due to inhibition of CYP1A2 and CYP2E, therapeutic windows are required when dandelion is used alongside prolonged or heavy medical treatments (e.g., chemotherapy, anticoagulants, cardiac medications). Discontinuous courses are recommended as standard practice for draining-type indications.

Clinical Safety

Safety & Precautions

Dandelion has no known toxicity at therapeutic doses. Primary clinical concerns relate to CYP450 enzyme inhibition (drug interactions), theoretical hyperkalaemia with prolonged dietary-level use, and Asteraceae hypersensitivity.

⚠️

Adverse Effects & Toxicity

  • No known toxicity: No acute or chronic toxicity documented at therapeutic doses. The plant has an excellent safety record in traditional and clinical use.
  • Anaphylaxis & contact allergy: Anaphylactic reactions and allergic contact dermatitis possible in sensitised individuals. [35]
  • Asteraceae cross-reactivity: Risk of allergic reaction in those hypersensitive to other Asteraceae plants (ragweed, chamomile, chicory, echinacea).
  • Theoretical hyperkalaemia: Very high potassium content (4.5%) could theoretically cause hyperkalaemia with prolonged dietary-level use. Discontinuous courses recommended.
  • Cardiac case report: One documented case of QT interval prolongation (polymorphic ventricular tachycardia) with a supplement combining dandelion, boldo, and fucus. [34]
🚫

Contraindications & Drug Interactions

  • Pregnancy & breastfeeding: Contraindicated. Insufficient safety data; traditional emmenagogue associations warrant avoidance.
  • Cardiac & renal disease: Contraindicated in significant cardiac or renal impairment. Diuretic effect may exacerbate fluid and electrolyte imbalance.
  • CYP1A2 inhibition: Dandelion decreases CYP1A2 and CYP2E activity. Relevant for co-administered drugs metabolised by these isoenzymes (e.g., some antidepressants, antipsychotics, certain antibiotics).
  • CYP450 interactions — chemotherapy: Therapeutic windows are mandatory when dandelion is used alongside chemotherapeutic agents. Protocols must be respected; discontinuous courses only.
  • Asteraceae allergy: Known allergy to any Asteraceae plant is a contraindication to dandelion use.
Clinical Disclaimer: This monograph is for educational and professional reference only. It does not constitute medical advice, diagnosis, or treatment guidance. Taraxacum officinale preparations should be used under the supervision of a qualified healthcare provider. The Health Reference reviews content against current primary literature.
Common Questions

Frequently Asked Questions

What are the main active compounds in Dandelion?
Dandelion's key bioactive constituents include inulin (up to 40% in the autumn root), sesquiterpene lactones (taraxinic acid, taraxacoside), pentacyclic triterpene alcohols (taraxasterol, beta-amyrin, arnidiol, faradiol), flavonoids (luteolin glucoside, apigenin glucosides, quercetin), phenolic acids (caffeic, chicoric, ferulic), coumarins (scopoletin, umbelliferone), and potassium (4.5% in the whole plant). The sesquiterpene lactones — formerly called "taraxacin" — are responsible for the characteristic bitterness and hepatic enzyme stimulation.
Is Dandelion clinically proven as a diuretic?
Yes. A human clinical study (Clare et al., 2009) demonstrated a significant increase in urination frequency and volume following a single-day leaf extract of Taraxacum officinale. The diuretic effect is attributed to the high potassium content — which compensates for potassium loss during diuresis — and the osmotic action of inulin in the renal tubule. Unlike many pharmaceutical diuretics, dandelion naturally replaces potassium it causes to be excreted, making it uniquely self-compensating.
Can Dandelion interact with medications?
Yes. Dandelion inhibits CYP1A2 and CYP2E hepatic microsomal enzymes, which could alter plasma levels of drugs metabolised by these pathways. No significant effect was observed on CYP2D or CYP3A in the available studies. A case report also documented QT interval prolongation with a supplement combining dandelion, boldo, and fucus. Patients on anticoagulants, cardiac medications, chemotherapy, or drugs with narrow therapeutic indices should consult a clinician before regular use and should observe therapeutic windows.
What parts of Dandelion are used medicinally and when are they harvested?
Both the root and the leaf are officinal. The root is harvested in autumn, when inulin content peaks at up to 40% and protein reserves are highest. The leaf is harvested in spring, when fructose content peaks at 18% and vitamin C and beta-carotene levels are highest. The root is the primary pharmacopoeial part listed in the French Pharmacopoeia Liste A, and is the basis for EPS (standardised plant extracts) and dry extracts used clinically for hepatic, renal, and metabolic indications.
Does Dandelion have anticancer activity?
Preclinical evidence suggests significant antineoplastic activity. Taraxacum officinale extracts have demonstrated cytotoxicity against hepatocellular carcinoma (Hep G2) cells via TNF-alpha and IL-1alpha secretion, antiproliferative and anti-invasive activity against breast (MCF-7/AZ) and prostate cancer cell lines, and differentiation-inducing activity in melanoma cells via lupeol (a lupane-type triterpene). Anti-angiogenic effects and inhibition of COX-2-mediated NO production have also been documented. Clinical translation has not yet been established in human trials.
Is Dandelion safe for long-term use?
Dandelion has no known toxicity at therapeutic doses. The main cautions are: CYP1A2/CYP2E enzyme inhibition creating drug interaction risk; theoretical hyperkalaemia risk with prolonged dietary-level use due to very high potassium content (discontinuous courses are strongly recommended); anaphylactic and contact allergic reactions in Asteraceae-sensitised individuals; and contraindication in pregnancy, breastfeeding, and significant cardiac or renal disease. As with all "draining" plants, discontinuous courses (e.g., 10 days per month) are the standard approach rather than continuous long-term use.
Primary Literature

Bibliography

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Additional Clinical & Reference Literature

Sweeney B et al. Evidence-based systematic review of dandelion (Taraxacum officinale) by Natural Standard Research Collaboration. J Herb Pharmacother. 2005;5(1):79–93. PubMed PMID:16093238 →