Dandelion root: Evidence, Trial Doses & Interactions

About Dandelion root

Root or leaf preparations of the common dandelion, used traditionally as a bitter digestive and as a diuretic. Roasted root is also sold as a coffee substitute.

Dandelion is ubiquitous in "liver support" and "cleanse" products and has almost no controlled human research behind either use. The one small human study of note measured urine output after dandelion leaf extract in 17 people over a single day. The plant is a well-recognised contact allergen within the daisy family and its bitter action on bile makes it a poor choice with gallstones.

Sold as

Root capsule, Roasted root beverage, Leaf tincture, Tea, Fresh greens

Also known as

Taraxacum, Lion’s tooth, Pissenlit

What the research used

The amounts, forms and durations published trials of Dandelion root actually administered.

These are the amounts published trials administered — not a recommendation, and not a dose to copy. Trial participants were screened, supervised and given a characterised preparation. What is in a retail bottle is frequently not what was studied, and the amount that suits one person is not general advice.

Studied for General supplement use
500–2000 mg
Not enough
Root powder or extract capsule
Trial dosing is not established for dandelion. The only human diuretic study used a leaf tincture in 17 people for one day, which cannot support a dose for anything.

This is general information about food, not medical advice. It cannot diagnose, treat or replace guidance from a clinician who knows your history.

When it was taken

Each window says whether a trial compared it against an alternative, or whether it is convention and pharmacology. Most timing advice is the second kind.

None of the timings below were directly compared in a trial. They reflect how the research happened to dose, or what the pharmacology implies — which is not the same as a timing being better.

With food
Not enough
Taken before meals in the tradition of digestive bitters. No timing comparison has been made.
Timing was not directly compared. This reflects convention or how the compound behaves in the body, not a trial showing this window works better.

What each association actually rests on, and the papers behind it. A rating describes the state of the research, not how promising the supplement sounds. How we rate evidence.

Digestive comfort

Gut & Digestive Health

Not enough evidence

There is not enough human research to say dandelion affects digestive symptoms. Its use as a bitter rests on tradition and on animal work on bile secretion.

Not enough evidence. Not enough human research to say anything useful yet.

View the 3 sources

Unveiling the genus Taraxacum: From folk medicine to chemodiversity-driven pharmacological and toxicological outcomes-A systematic review.(opens in a new tab)
Systematic review · Journal of ethnopharmacology · 2026 · PMID 41554454
[Phytotherapy with a mixture of dry extracts with hepato-protective effects containing artichoke leaves in the management of functional dyspepsia symptoms].(opens in a new tab)
Clinical trial · Minerva gastroenterologica e dietologica · 2010 · PMID 20485248
[Treatment of intestinal metaplasia and atypical hyperplasia of gastric mucosa with xiao wei yan powder].(opens in a new tab)
Randomised controlled trial · Zhongguo Zhong xi yi jie he za zhi Zhongguo Zhongxiyi jiehe zazhi = Chinese journal of integrated traditional and Western medicine · 1992 · PMID 1302542

Deep research mode adds each paper’s own conclusion and stated limitations.

Kidney and urinary function

Kidney & Urinary Health

Not enough evidence

Evidence is limited for dandelion as a diuretic in people. A single small pilot study measured increased urine frequency over one day, which is not a basis for any conclusion.

Not enough evidence. Not enough human research to say anything useful yet.

View the 2 sources

Unveiling the genus Taraxacum: From folk medicine to chemodiversity-driven pharmacological and toxicological outcomes-A systematic review.(opens in a new tab)
Systematic review · Journal of ethnopharmacology · 2026 · PMID 41554454
The diuretic effect in human subjects of an extract of Taraxacum officinale folium over a single day.(opens in a new tab)
Clinical trial · Journal of alternative and complementary medicine (New York, N.Y.) · 2009 · PMID 19678785

Deep research mode adds each paper’s own conclusion and stated limitations.

Liver markers

Liver Health

Not enough evidence

There is no dependable human research behind dandelion and liver function, despite its central place in products marketed for liver support.

Not enough evidence. Not enough human research to say anything useful yet.

View the 3 sources

[Phytotherapy with a mixture of dry extracts with hepato-protective effects containing artichoke leaves in the management of functional dyspepsia symptoms].(opens in a new tab)
Clinical trial · Minerva gastroenterologica e dietologica · 2010 · PMID 20485248
[Clinical effect of compound monoammonium glycyrrhizinate combined with dandelion in treatment of acute paraquat poisoning].(opens in a new tab)
Clinical trial · Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases · 2016 · PMID 27682493
[Clinical study of 96 cases with chronic hepatitis B treated with jiedu yanggan gao by a double-blind method].(opens in a new tab)
Clinical trial · Zhong xi yi jie he za zhi = Chinese journal of modern developments in traditional medicine · 1990 · PMID 2364464

Deep research mode adds each paper’s own conclusion and stated limitations.

Things to know

Interactions, contraindications and dose limits, most serious first. Concentrated extracts interact with medication in ways the whole plant does not, so this section carries more weight here than it does on a food page.

Allergy
Asteraceae allergy and contact dermatitis
Dandelion is a well-documented cause of allergic contact dermatitis, and people sensitised to ragweed, chrysanthemum or marigold may react to oral preparations too.
Avoid
Bile duct obstruction and gallstones
Its effect on bile flow makes it inadvisable in bile duct obstruction, gallstones or active gallbladder inflammation.
Interaction
Diuretics, lithium and potassium
Interacts withDiuretics, lithium, potassium-sparing agents
A diuretic effect can add to prescribed diuretics and alter lithium levels. Dandelion is also high in potassium, which matters alongside potassium-sparing diuretics or in kidney impairment.
Interaction
Drug metabolism and antibiotics
Interacts withCiprofloxacin, CYP substrates
Laboratory work suggests effects on CYP enzymes, and animal data indicate dandelion may reduce absorption of some quinolone antibiotics.
Avoid
Pregnancy
Concentrated preparations have not been studied in pregnancy, though the greens are eaten as a vegetable.

Dandelion root

What dandelion root may help with

About Dandelion root

What the research used

When it was taken

With food

The evidence in depth

Digestive comfort

Kidney and urinary function

Liver markers

Things to know

Asteraceae allergy and contact dermatitis

Bile duct obstruction and gallstones

Diuretics, lithium and potassium

Drug metabolism and antibiotics

Pregnancy

What dandelion root may help with

About Dandelion root

What the research used

When it was taken

🍽️With food

The evidence in depth

Digestive comfort

Kidney and urinary function

Liver markers

Things to know

Asteraceae allergy and contact dermatitis

Bile duct obstruction and gallstones

Diuretics, lithium and potassium

Drug metabolism and antibiotics

Pregnancy

In the food catalogue

With food