Leaf (diuretic) or root (digestive/liver), depending on the product.
Mild diuretic effect.
Traditional use as a digestive aid; little evidence.
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Dandelion is Taraxacum officinale, a perennial plant common in meadows, gardens, and roadsides of Europe and North America whose root, leaves, and flowers have been used for centuries in traditional European medicine as a liver tonic, choleretic, diuretic, and general depurative; the common name "dandelion" (from the French "dent de lion", lion's tooth) refers to the characteristic toothed leaves, and the scientific name Taraxacum derives from the Arabic "tarakhshakum", reflecting its use in medieval Arabic medicine, where Avicenna already prescribed it for liver and biliary problems.
The plant has different phytochemical profiles depending on the part used: the root contains mainly inulin, phytosterols (taraxasterol), bitter sesquiterpene lactones (responsible for the digestive stimulation), and polyphenols; the leaves are rich in flavonoids, chlorogenic acid, potassium (one of the most concentrated plant sources of this mineral), and carotenoids; the flowers provide flavonoids and coumarins; commercial products may be leaf, root, or a mixture, and it is worth knowing which part is being used for each clinical indication.
The main traditional indication is as a mild choleretic and cholagogue (a stimulant of bile production and flow), with documented use in functional biliary dyspepsia, postprandial fullness, and digestive disorders due to biliary insufficiency; modern clinical data are limited but consistent with traditional use and with the activity documented in vitro and in animal models on hepatobiliary function.
The German Commission E (the German regulatory body that evaluated traditional herbal medicine using a systematic methodology) recognizes the use of dandelion root and whole plant for "disorders of bile flow, stimulation of diuresis, loss of appetite, and dyspepsia", a regulatory validation that places dandelion among the small group of medicinal plants with institutional backing for digestive and hepatobiliary indications.
Dandelion leaves have documented mild diuretic activity, historically reflected in some European common names related to diuresis (in French "pissenlit", literally "wet the bed"); the clinical peculiarity of this diuretic effect is that, unlike pharmacological thiazide or loop diuretics, dandelion leaves are so rich in potassium that the urinary potassium loss induced by diuresis is offset by the oral intake from the remedy itself, theoretically avoiding the classic hypokalemia of synthetic diuretics.
The bitter leaves and root stimulate salivary, gastric, and biliary secretion, improving appetite and digestion in people with functional dyspepsia due to digestive hypoactivity; traditional preparations (decoctions, bitter tinctures, roasted root coffee) have been used for centuries as digestive aperitifs before meals, a practice with a reasonable physiological basis although modern clinical data are limited.
Traditional doses are: for infusion, 1-2 teaspoons of dried leaf or root per cup, 2-3 times a day; for tincture, 1-2 ml three times a day; for dry extract, 500-2,000 mg/day divided; for roasted root coffee, one cup 1-2 times a day as a substitute for conventional coffee; for digestive use, before meals; for diuretic use, spread throughout the day.
Generally very well tolerated in traditional use; the adverse effects described are rare and mild (digestive discomfort, occasionally allergic skin reactions in people sensitive to the Asteraceae family such as chamomile, chrysanthemum, ragweed); people with mechanical biliary obstruction (large gallstones at risk of impaction, bile duct obstruction) should avoid it because of the choleretic effect; those taking pharmacological diuretics should be cautious because of possible potentiation of the diuretic effect and changes in fluid and electrolyte balance; those taking lithium should be cautious because of possible alteration of renal clearance; those taking anticoagulants may experience interference from the vitamin K content; in pregnancy and breastfeeding, traditional dietary amounts are considered safe but concentrated therapeutic doses should be avoided; people with serious renal insufficiency should consult first because the high potassium concentration could be problematic; cheap products may be contaminated (it is a plant that commonly grows near roads and areas where pesticides are used), and it is advisable to choose products from controlled cultivation or safe wild sources.
Information, not medical advice. Scientific evidence reflects the quality of the studies.