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Dandelion Root

Taraxacum officinale
Evidence Level
Preliminary
3 Clinical Trials
4 Documented Benefits
1/5 Evidence Score

Dandelion root is the root of the common dandelion (Taraxacum officinale), a plant used as both a food and a medicinal herb; its flowers, leaves and root have traditionally been used in Mexican and other North American medicine, and oral products are promoted for indigestion. The root contains short-chain inulin-type fructans (a prebiotic fiber) and sesquiterpene lactones. Human research is thin. A fresh leaf extract increased urination in 17 volunteers over one day in an uncontrolled study, but about 2.1 g of a commercial root powder taken with 1 liter of water did not raise urine output above water alone in a controlled crossover study. A maker-funded trial of a four-herb liquid that included dandelion root reported lower liver enzymes in healthy adults, but that design cannot isolate dandelion. Food amounts are considered likely safe; larger amounts are less studied.

Studied Dose No dose of dandelion root has been shown to work for any outcome. Human studies used about 2.1 g of commercial root powder in capsules once, with 1 liter of water (no diuretic effect), and 8 mL of a fresh leaf extract three times in one day (a leaf product).
Active Compound Inulin-type fructans (short-chain, including kestose and nystose), sesquiterpene lactones, and phenolics such as chicoric acid and luteolin

Benefits

Urine output and fluid balance

Dandelion is traditionally used as a diuretic. A fresh leaf extract increased how often 17 volunteers urinated after the first dose of a one-day study with no control group, and the third dose changed nothing. A root powder (about 2.1 g) taken with 1 liter of water did not increase 4-hour urine output compared with water alone in 14 active young adults.

Supported by Trial 1, Trial 2

Liver enzyme levels in a four-herb formula

In a 180-day placebo-controlled trial in 130 healthy adults, a liquid blend of turmeric, dandelion root, milk thistle and ginger lowered ALT, AST, ALP and GGT more than placebo, with no adverse events reported. The maker funded and helped design the study, the dandelion amount was not disclosed, and dandelion alone was never tested.

Supported by Trial 3

Antioxidant and NF-κB activity in cell studies

Dandelion extracts reduced nitric oxide production, restored antioxidant enzymes and suppressed NF-κB signaling in a stimulated laboratory cell line, and a leaf extract activated the Nrf2 antioxidant switch in human liver cells more than a root extract did. No study has measured an antioxidant outcome in people taking dandelion root.

Supported by Trial 3, Trial 1

Prebiotic inulin-type fiber

Dandelion root contains inulin, and chromatography shows it is rich in short-chain fructans such as kestose and nystose, at levels above those in artichoke heads. These fibers are prebiotics in principle, but no trial cited here has tested dandelion root on gut bacteria or digestion in people.

Supported by Trial 1, Trial 2

Mechanism of action

1

Bile flow (traditional reputation)

Dandelion has been used for dyspepsia and liver complaints, and a review of the genus covers choleretic (bile-stimulating) effects among those reported for it. The same review says this use has mainly been based on empirical findings and calls for testing in humans; no study cited here measured bile flow in people.

2

NF-κB and antioxidant enzymes in cells

In RAW 264.7 cells stimulated with LPS, methanol and water extracts of dandelion lowered nitric oxide output, inhibited iNOS and NF-κB, and restored catalase, glutathione peroxidase and glutathione reductase. The methanol extract, richer in phenols, luteolin and chicoric acid, was the more potent.

3

Nrf2 activation by sesquiterpene lactones

Leaves and roots contain sesquiterpene lactones. The main leaf compound, taraxinic acid glucosyl ester, and the leaf extract activated Nrf2 in human liver cells more strongly than the root extract, and the leaf extract induced heme oxygenase 1. This is laboratory work only.

4

Short-chain inulin fructans

Dandelion root inulin has a short chain length, with kestose, nystose and fructofuranosylnystose present at higher levels than in artichoke. Such fructans are fermented by gut bacteria in general, but this has not been measured for dandelion root in people.

Clinical trials

1
Dandelion Leaf Extract and Urination Over One Day
PubMed

Single-arm study: volunteers recorded fluid intake and urine output for 2 baseline days, a dosing day of 8 mL fresh leaf hydroethanolic extract three times, and 24 hours after. Leaf, not root, was tested. NIH-supported. (Clare et al. 2009, J Altern Complement Med)

17 volunteers.

Urination frequency rose significantly in the 5 hours after the first dose, and the excretion ratio (urine volume to fluid intake) rose in the 5 hours after the second dose. The third dose changed none of the measures. There was no placebo or control group.

2
Dandelion Root Powder and 4-Hour Urine Output
PubMed

Open-label counterbalanced crossover: 1 L of still water with or without four capsules giving about 2.1 g of a commercial dandelion root powder; primary outcome was cumulative urine output over 4 hours. (Gavin et al. 2026, Int J Sport Nutr Exerc Metab)

14 physically active young adults (12 men, 2 women), mean age 25.5 years.

Null primary outcome. Urine output was 1,268 g with dandelion root and 1,164 g with water alone, a difference of 105 g (95% CI minus 35 to 244 g, p = 0.13). The authors concluded the results do not support the purported diuretic effect.

3
Four-Herb Liquid Formula Including Dandelion Root and Liver Enzymes
PubMed

Randomized, double-blind, placebo-controlled: 60 mL of the liquid or placebo twice daily for 180 days; each dose had 435 mg of a proprietary blend of turmeric extract, dandelion root powder, milk thistle seed extract and ginger. Funded by the maker (Eetho Brands), which took part in design, interpretation, writing and the decision to publish; one author was employed by the brand. (Patel et al. 2025, Front Nutr)

130 healthy adults with liver enzymes within the normal range at entry (65 per group).

Mean reductions in ALT, AST, ALP and GGT were significantly greater with the formula than placebo (p of 0.001 or less), and no adverse events were reported. Because four herbs were given together and the dandelion amount is not stated, the result cannot be credited to dandelion.

Side effects and drug interactions

Common Potential side effects

Amounts commonly found in food are considered likely safe; less is known about the safety of larger supplement amounts.
Topical dandelion may cause allergic reactions in people with atopic dermatitis (eczema), and evidence is conflicting on whether people sensitive to ragweed, chrysanthemums, marigolds or daisies react to it.
Little is known about amounts larger than those in food during pregnancy or breastfeeding.
Acute liver injury with a cholestatic pattern was reported in a 36-year-old woman about one month after starting an over-the-counter liver detox tea containing burdock root, stinging nettle leaf, cleavers herb, dandelion root, lemon peel and lemon myrtle leaf; the authors attributed it to the tea as a whole and did not single out one herb. Her liver tests improved after the tea was stopped and she was given a single loading dose of N-acetylcysteine. One case cannot prove which herb, if any, was responsible.

Important Drug interactions

Diabetes medicines: a theoretical interaction (NCCIH); ask a clinician before combining.
Anticoagulant and antiplatelet drugs: a theoretical interaction (NCCIH).
Water pills (diuretics): a theoretical interaction (NCCIH).

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Frequently asked questions about Dandelion Root

What is Dandelion Root used for?

Dandelion is used as both a food and a medicinal herb. Oral dandelion products are promoted for indigestion, and dandelion has a long folk use as a diuretic. NutraSmarts lists no health category for it because no human trial has shown a benefit from dandelion root alone.

Does dandelion root work as a diuretic?

Not in the one root study. About 2.1 g of commercial root powder taken with 1 liter of water did not raise 4-hour urine output above water alone in 14 active adults. A separate one-day study of a fresh leaf extract, with no control group, found more frequent urination in 17 volunteers.

Is dandelion leaf the same as dandelion root?

No. They are different plant parts, and in lab work a leaf extract activated a cellular antioxidant switch more strongly than a root extract. The only positive diuretic study tested leaf, so its result does not carry over to root products.

Is Dandelion Root safe, and does it have side effects?

Food amounts are considered likely safe, but less is known about larger supplement amounts or use in pregnancy and breastfeeding. Allergic reactions are possible, and one case of liver injury followed a six-herb liver detox tea that included dandelion root. There are also theoretical interactions with diabetes, blood-thinning, antiplatelet and water pill medicines, so check with a clinician if you take any of these.

What is Dandelion Root?

Dandelion root is the root of the common dandelion (Taraxacum officinale), a plant used as both a food and a medicinal herb; its flowers, leaves and root have traditionally been used in Mexican and other North American medicine, and oral products are promoted for indigestion.

What is the recommended dosage of Dandelion Root?

No dose of dandelion root has been shown to work for any outcome. Human studies used about 2.1 g of commercial root powder in capsules once, with 1 liter of water (no diuretic effect), and 8 mL of a fresh leaf extract three times in one day (a leaf product). Always follow the product label and check with a healthcare provider for personal advice.

Does Dandelion Root interact with any medications?

Possible interactions include: Diabetes medicines: a theoretical interaction (NCCIH); ask a clinician before combining. Anticoagulant and antiplatelet drugs: a theoretical interaction (NCCIH). If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Dandelion Root?

NutraSmarts rates the evidence for Dandelion Root as Preliminary (1 out of 5). It is backed by 3 study summaries and 9 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(9 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Schütz K, Carle R, Schieber A. Taraxacum--a review on its phytochemical and pharmacological profile. J Ethnopharmacol. 2006;107(3):313-23. doi: 10.1016/j.jep.2006.07.021.PubMedUsed to support: Review of Taraxacum compounds and pharmacology, covering diuretic, choleretic, anti-inflammatory, antioxidant, prebiotic and other reported effects. States that traditional use for dyspepsia and liver complaints has mainly been based on empirical findings and that activity in humans still needs to be assessed.
  2. Clare BA, Conroy RS, Spelman K. The diuretic effect in human subjects of an extract of Taraxacum officinale folium over a single day. J Altern Complement Med. 2009;15(8):929-34. doi: 10.1089/acm.2008.0152.PubMedUsed to support: Uncontrolled one-day study in 17 volunteers taking 8 mL of fresh dandelion leaf extract three times: urination frequency rose after the first dose and the excretion ratio after the second, while the third dose changed nothing. Leaf, not root, was tested.
  3. Park CM, Park JY, Noh KH, Shin JH, Song YS. Taraxacum officinale Weber extracts inhibit LPS-induced oxidative stress and nitric oxide production via the NF-κB modulation in RAW 264.7 cells. J Ethnopharmacol. 2011;133(2):834-42. doi: 10.1016/j.jep.2010.11.015.PubMedUsed to support: Cell study: methanol and water extracts of dandelion reduced nitric oxide production, restored antioxidant enzymes and inhibited iNOS and NF-κB in LPS-stimulated RAW 264.7 cells; the methanol extract, higher in phenols, luteolin and chicoric acid, was more potent. Not a human study.
  4. Gavin J, Caulfield C, Egan B. Co-Ingestion of a Commercially Available Dandelion Root Powder Elicited No Additional Diuretic Effect Over 4 Hr Compared to Ingestion of Water Alone in Physically Active Young Adults. Int J Sport Nutr Exerc Metab. 2026;36(5):523-531. doi: 10.1123/ijsnem.2026-0001.PubMedUsed to support: Open-label crossover in 14 active young adults: about 2.1 g of commercial dandelion root powder taken with 1 L of water did not increase 4-hour urine output compared with water alone (1,268 g vs 1,164 g, p = 0.13).
  5. Patel G, Shah S, D'Adamo CR. Long-term safety and efficacy of a highly purified plant-based nutraceutical for improving clinical parameters of liver function in healthy participants: a randomized, double-blind, placebo-controlled clinical trial. Front Nutr. 2025;12:1721748. doi: 10.3389/fnut.2025.1721748.PubMedUsed to support: Maker-funded 180-day randomized trial in 130 healthy adults: a liquid blend of turmeric, dandelion root, milk thistle and ginger lowered ALT, AST, ALP and GGT more than placebo, with no adverse events reported. Dandelion was not tested on its own and its amount is not disclosed.
  6. Schütz K, Muks E, Carle R, Schieber A. Separation and quantification of inulin in selected artichoke (Cynara scolymus L.) cultivars and dandelion (Taraxacum officinale WEB. ex WIGG.) roots by high-performance anion exchange chromatography with pulsed amperometric detection. Biomed Chromatogr. 2006;20(12):1295-303. doi: 10.1002/bmc.694.PubMedUsed to support: Chromatography study showing that dandelion root inulin is short-chain, with kestose, nystose and fructofuranosylnystose contents exceeding those of artichoke heads.
  7. Esatbeyoglu T, Obermair B, Dorn T, Siems K, Rimbach G, Birringer M. Sesquiterpene Lactone Composition and Cellular Nrf2 Induction of Taraxacum officinale Leaves and Roots and Taraxinic Acid β-d-Glucopyranosyl Ester. J Med Food. 2017;20(1):71-78. doi: 10.1089/jmf.2016.0105.PubMedUsed to support: Lab study of sesquiterpene lactones in dandelion leaves and roots: the leaf extract and its main compound, taraxinic acid glucosyl ester, activated Nrf2 in human liver cells more strongly than the root extract, and the leaf extract induced heme oxygenase 1.
  8. National Center for Complementary and Integrative Health. Dandelion (fact sheet). NCCIH, National Institutes of Health. 2024;Last updated November 2024. Accessed October 2026..SourceUsed to support: Not PubMed-indexed; read on the NCCIH website. Says little is known about dandelion's effect on human health and there is no compelling evidence for any health condition; food amounts are likely safe, larger amounts less studied; possible allergy in atopic dermatitis and conflicting evidence on ragweed-family cross-reactions; theoretical interactions with antidiabetes, anticoagulant, antiplatelet and water pill drugs; little known about pregnancy and breastfeeding.
  9. Niazi B, Ahmed K, Ahmed M, Ali S, Song K, Elias S. Drug-Induced Liver Injury from Herbal Liver Detoxification Tea. Case Rep Gastroenterol. 2022;16(3):612-617. doi: 10.1159/000526311.PubMedUsed to support: Case report, not a trial: a 36-year-old woman developed acute liver injury with a cholestatic pattern on liver biopsy about one month after starting an over-the-counter herbal liver detox tea whose listed ingredients were burdock root, stinging nettle leaf, cleavers herb, dandelion root, lemon peel and lemon myrtle leaf. The tea was stopped, she received a loading dose of N-acetylcysteine (further doses were held because of nausea and vomiting), and her liver tests and abdominal pain improved over a 12-day hospital stay. The authors attributed the injury to the tea and did not single out any one herb; one case cannot prove cause.