Chicory, Endive & Radicchio: Nutrients, What Research Shows and Safety

Chicory, endive and radicchio are leaf vegetables from two closely related plants in the daisy family (Asteraceae): chicory (Cichorium intybus, which includes radicchio) and endive (Cichorium endivia, which includes escarole). The leaves are eaten raw in salads or cooked, and they taste bitter. People eat them for their vitamin K, folate and fiber and because they are a leafy green. This page keeps the leaves apart from chicory root, supplements and hype.

Read this first

• Warfarin: both endive and radicchio are very high in vitamin K. MedlinePlus says vitamin K affects how warfarin works and that a steady intake from day to day matters. If you take warfarin, ask your prescriber or clinic before changing how much of these leaves you eat. [1][2][3]
• Allergy: these plants are in the same family as ragweed, mugwort and lettuce. Allergy to chicory has been described in people allergic to birch pollen. For trouble breathing or swelling of the face or throat, call 911. See food allergy basics and emergency signs. [5][6]
• Leaves are not the root: the inulin fiber people read about comes from chicory root, not from salad leaves. See chicory root.
• Honest summary: the nutrient numbers are solid. We found no human trial of endive or radicchio leaves for any disease; claims come from studies of vegetables in general or from lab work. [4][11]

What is in it (USDA values)

Source: USDA FoodData Central, SR Legacy, raw endive (FDC 168412) [1] and raw radicchio (FDC 168564) [2]. % Daily Value uses the FDA 2016 Daily Values; values vary with variety, ripeness and storage.

Plant compounds: USDA lists beta-carotene in raw endive (1,300 mcg per 100 g) and lutein plus zeaxanthin in raw radicchio (8,832 mcg per 100 g). [1][2] A lab study of escarole (a kind of endive) found phenolic compounds, flavonoids and sesquiterpenes in the outer leaves and measured antioxidant activity in test tubes and cells, with no human participants. [11] A review lists sesquiterpene lactones, chicoric acid, chlorogenic acid and flavonoids among the compounds of chicory, mostly for the whole plant and the root. [10] These findings are from the lab, not from people.

What research says

Eaten as food vs taken as a supplement or extract. Everything above is about eating the leaves. Chicory root, inulin powders and extracts are separate products with their own trials and safety questions, covered on chicory root and prebiotic foods. We did not find a source that measured inulin in endive or radicchio leaves, so we make no claim that they act as a prebiotic.

How much is a normal serving

• USDA household portions: 0.5 cup chopped endive (25 g) and 1 cup shredded radicchio (40 g). [1][2] This is information, not a prescription.
• WHO says at least 400 g of fruits and vegetables a day for people older than 10. [13] The NHS counts 80 g of fresh, canned or frozen vegetables as one portion. [14]
• Cooking effects on nutrients: Proper evidence not found in the sources we read for these leaves. See fresh, frozen and canned produce.

Safety, allergy and medicines

• Warfarin and other vitamin K blood thinners: MedlinePlus says vitamin K affects how warfarin works, that sudden changes in intake can change the medicine's effect, and that leafy greens are the main food source. Steady intake is the aim, and your provider can tell you whether to monitor it. [3] Because these leaves are rich in vitamin K [1][2], the same rule applies. This is not a reason to avoid them; it is a reason to keep intake steady and tell the warfarin clinic. See foods and medicine interactions. We did not read a source about newer blood thinners that do not work through vitamin K.
• Ragweed-family and pollen allergy: chicory belongs to the daisy family (Asteraceae). A 2025 review says Asteraceae plants are known occupational sensitizers, and pollen proteins from ragweed and mugwort drive cross-reactions and pollen-food allergy syndromes. Its abstract does not name chicory. [6] A 2003 study of four people with birch pollen allergy and oral allergy syndrome to chicory found proteins in chicory that bind their antibodies, and the authors say chicory should be listed among foods that cross-react with birch. [5] Typical signs of oral allergy are itching in the mouth and throat after eating raw leaves.
• Severe reactions: a 2025 case report describes anaphylaxis to lettuce in a florist with contact allergy to daisy-family plants; the keywords include chicory and radicchio, but the record had no abstract, so we only know what its title and keywords say. [7] See anaphylaxis and severe allergic reactions.
• Gas and bloating: a review of 103 trials of non-digestible carbohydrates such as inulin lists gas and bloating among tolerance effects, which depend on the fiber and the amount. [9] This applies mainly to concentrated inulin; we did not find data for the leaves.
• Potassium and kidneys: leaves have about 300 mg of potassium per 100 g, a small amount per serving (2-3% of the Daily Value). [1][2] People with kidney disease or on medicines that raise potassium should still follow their care team's advice.
• Pregnancy, medicines other than warfarin, children: not described in the sources we read. Lack of information is not proof of safety; ask a pharmacist or clinician.

Choosing, storing and food safety

• Choose leaves that are not bruised or damaged. For pre-cut or bagged items, buy only those kept refrigerated or on ice. [12]
• Keep leaves at 40°F (4°C) or below and refrigerate cut or packaged produce. [12]
• Rinse under running water, including bagged leaves not labeled as pre-washed; do not use soap or produce wash. Washing can reduce bacteria but will not eliminate them. [12]

Related pages

• Leafy greens: research and vitamin K with warfarin
• Foods and medicine interactions: vitamin K, grapefruit and others
• Chicory root
• Prebiotic foods: inulin, onions, garlic and more
• Herbal allergy and cross-reactivity
• Fresh, frozen and canned produce