Chicory

Chicory (Cichorium intybus L.): A Comprehensive Reference

1. Identity and Botanical Description

The genus Cichorium (family Asteraceae) is made up of six species with major geographical presence in Europe and Asia. Cichorium intybus L., commonly known as chicory, is a perennial herbal plant most often bearing bright blue flowers that has been grown since ancient times. It is native to the Mediterranean region, with a long-standing history as a medicinal herb.

The plant grows up to a height of 150 cm, with a thick, strong, irregularly branched stem, a long, robust, thick brown taproot, lobed and unlobed leaves, seed-like fruits, and flowers of various colours. The flowers are blue in colour and are known to have the characteristic of opening in the morning and closing at dusk. Chicory is a hardy plant and can endure extreme temperatures during both vegetative and reproductive growth stages. When broken, all plant parts exude a milky latex.

The plant is known by numerous common names across cultures. It is also called blue daisy, blue sailor, blue weed, bunk, coffee weed, hendibeh, horseweed, succor, ragged sailors, wild bachelor's buttons, blue dandelion, and wild endive. In South Asian traditional medicine, it is known as Kasni or Kashni.

The genus name Cichorium is derived from the Greek word kichore, which refers to the plant's ancient use as a culinary herb. The species name intybus is derived from the Latin word for "endive," reflecting the close relationship between chicory and endive.

Common Forms and Preparations

• Dried root: The dried root is the primary part used medicinally and as a food ingredient.
• Roasted root / coffee substitute: The roasted root has a flavor similar to coffee but is caffeine-free, making it a popular alternative for those seeking to avoid caffeine.
• Inulin extract: The inulin used for medicinal and supplemental purposes is most commonly obtained by soaking chicory roots in hot water.
• Root flour: Chicory as a functional food has been studied by the food industry in the form of root flour.
• Decoctions and tinctures: Chicory decoctions are traditionally made from individual plant parts and/or from the plant as a whole.
• Food additive: Apart from its phytochemical applications, chicory is also used in gastronomy as a coffee substitute, food additive, and drink additive.

2. Traditional and Historical Use

Historically, chicory was grown by the ancient Egyptians as a medicinal plant, and it has had a long history of therapeutic use both in areas where it is indigenous and in areas where it has been introduced. Cichorium intybus has a long tradition of use globally. Historically, it was grown by the ancient Egyptians as a medicinal plant, coffee substitute, and vegetable crop, and was occasionally used for animal forage.

The ancient Egyptians consumed large amounts of chicory because it was believed that the plant could purify the blood and liver, while others relied on the herb for its power to cure "passions of the heart." By the time of Hippocrates (5th century BCE), chicory was noted for easing spleen and liver discomfort. Romans cooked chicory roots as a vegetable; Pliny the Elder wrote of its diuretic and tonic virtues. Classical therapists including Virgil, Ovid, Pliny, and Horace mentioned this herb for use as a vegetable and as an important salad ingredient.

As a panacea for the Greeks and Romans, it was used to restore the affections and fix the disorders of the liver and the circulatory system. The chicory sprouts are still used in a common Roman dish called Puntarelle. In South Asian tradition, though not native, chicory found its way into Unani and Ayurvedic texts by medieval traders. It is considered one of the most important herbal plants in the Ayurveda, Unani, and Siddha medicinal systems to treat a variety of diseases.

In Indian Ayurveda, chicory is used as a resolvent and cooling medicine for the problems of bile (pitta) and the diseases of heat (Agni). Its extensive cultivation in Europe began in the 17th century and has been popular ever since. In Europe, chicory root became a popular coffee substitute during times of coffee shortages, particularly during the Napoleonic Wars and World War II.

Regional Traditional Applications

• Europe (general): According to the European monograph, traditional use of chicory roots includes the relief of symptoms related to mild digestive disorders (such as feeling of abdominal fullness, flatulence, and slow digestion) and temporary loss of appetite.
• Afghanistan: Folkloric reports described the use of aqueous root extracts as a light-sensitive plant remedy for malaria. This indigenous knowledge has since been confirmed, and the antimalarial compounds of C. intybus roots have been identified as the light-sensitive sesquiterpene lactones lactucin and lactucopicrin.
• Flowers (Germany and Europe): The flowers of the chicory plant (Cichorii flos) are used as a herbal treatment for everyday ailments such as a tonic, appetite stimulant, and as a treatment of gallstones, gastroenteritis, sinus problems, cuts, and bruises.
• Italy: In Italy, the whorls are made into a decoction and used as a depurative.
• India: Chicory seeds are one of the main ingredients of Jigrine, a commercial product of India used for the treatment of various diseases of the liver.
• South Africa: In South Africa, although it is considered a widespread weed, leaves, stems, and roots are made into a tea for jaundice, and chicory syrup is used as a tonic and purifying medicine for infants.
• Turkey: In Turkey, an ointment is made from the leaves for wound healing.
• Traditional medicine (general): In traditional medicine, this plant is used as a diuretic, anti-inflammatory, digestive, cardiotonic, and liver tonic.

3. Key Constituents and Active Compounds

Chicory contains various chemical constituents, including chicoric acid, sesquiterpene lactones, caffeic acid derivatives, inulin, sugars, proteins, volatile compounds, and more. Chicoric acid has been identified as the major compound in methanolic extracts of chicory. It is a viable source of biologically relevant elements (potassium, iron, calcium), vitamins (vitamin A, B1, B2, C), and bioactive compounds including inulin, sesquiterpene lactones, coumarin derivatives, chicoric acid, and phenolic acids.

Inulin and Inulin-Type Fructans (ITFs)

Inulin-type fructans are a group of carbohydrates classified as nonviscous, soluble, and fermentable fibers. Inulin, considered a dietary fibre, is a fructan with low energy density (1.5 kcal/g) and a beta (2-1)-D-fructosyl-fructose glycosidic bond structure. While chicory root is considered the biggest source of inulin, the fibre can be found in approximately 36,000 plant species. The roots of the chicory plant contain up to 40% inulin.

Inulin, fructo-oligosaccharides (FOSs), and galacto-oligosaccharides (GOSs) are considered accepted or proven prebiotics and exhibit the most robust evidence for health benefits. Inulin is not digested or absorbed in the stomach, but instead passes to the colon where it is fermented by resident microorganisms.

Sesquiterpene Lactones (STLs)

Chicory roots accumulate the guaianolide STLs 8-deoxylactucin, lactucin, and lactucopicrin, predominantly in oxalated forms in the latex. The most abundant STLs in chicory are lactucin (LC), 11β,13-dihydrolactucin (DHLC), lactucopicrin (LCP), and 11β,13-dihydrolactucopicrin (DHLCP). These bitter compounds are responsible for the characteristic taste of the plant and underlie several of its historically recognised bioactivities.

Phenolic Acids and Other Polyphenols

Chicory's antioxidant activity is associated with the presence of inulin, caffeic acid derivatives, ferulic acid, caftaric acid, chicoric acid, chlorogenic and isochlorogenic acids, dicaffeoyl tartaric acid, hydroxycoumarins, flavonoids, and sesquiterpene lactones. The flowers of chicory contain saccharides, methoxycoumarin cichorine, flavonoids, essential oils, and anthocyanins contributing to the blue colour of the perianth.

4. Established Mechanisms of Action

Prebiotic / Microbiota Modulation

Evidence from human clinical studies indicates that ITFs have a prebiotic effect on the intestinal microbiota, promoting the abundances of Bifidobacterium, Lactobacillus, and Faecalibacterium prausnitzii. Enrichment in the abundance of Bifidobacterium spp. is characteristic of prebiotic consumption, but other bacteria linked to improved body weight regulation can also be altered, including reduced abundance of Desulfovibrio and Clostridium sensu stricto species.

Anti-inflammatory Mechanisms (Sesquiterpene Lactones)

Research investigates the anti-inflammatory properties of sesquiterpene lactones derived from Cichorium intybus L. (chicory), focusing on their modulation of NF-kB and AHR signalling pathways. Using a TNFα-induced inflammation model in macrophages, endothelial, and intestinal epithelial cells, lactucopicrin was identified as a potent NF-kB antagonist. In silico docking and functional assays also revealed lactucopicrin as a novel AHR modulator. Crucially, silencing AHR expression attenuated lactucopicrin-mediated NF-kB inhibition, uncovering a previously unrecognised AHR–NF-kB crosstalk mechanism. These findings position lactucopicrin as a dual-pathway modulator and highlight the therapeutic potential of chicory-derived sesquiterpene lactones in treating inflammation-driven diseases.

However, bioavailability of these compounds is a meaningful limitation. A significant obstacle limiting their pharmacological use is their poor aqueous solubility and low oral bioavailability. Following oral consumption of chicory preparations, a human pharmacokinetic study confirmed only LC and DHLC were detected in circulation at low concentrations, while in vitro fermentation assays demonstrated the conversion of LCP and LC into lactucin-type compounds by the gut microbiota. These findings indicate that chicory STLs undergo extensive presystemic metabolism involving microbial and phase II conjugation processes, resulting in very low plasma levels.

Anti-inflammatory Mechanisms (via COX-2 Inhibition)

Chicory extract has been reported in laboratory studies to inhibit the expression and activity of cyclooxygenase-2 (COX-2), a key enzyme in inflammatory signalling, though this work remains preclinical.

Gut Fermentation and Metabolite Production

Beneficial health effects reported following ITF intake include improved intestinal barrier function, improved laxation, increased insulin sensitivity, decreased triglycerides and an improved lipid profile, increased absorption of calcium and magnesium, and increased satiety.

5. Scientific Evidence by Area of Use

5.1 Gut Microbiota and Prebiotic Effects

A systematic review with meta-analyses demonstrates that inulin-type fructans derived from chicory root match the ISAPP (International Scientific Association for Probiotics and Prebiotics) definition of prebiotics: "a substrate that is selectively utilized by host microorganisms conferring a health benefit." This research evidenced that inulin, oligofructose, and combinations thereof, derived from chicory root, act as a bifidogenic factor, promoting the selective growth of Bifidobacteria. The researchers further reported that the bifidogenic effects of the chicory root fibres were accompanied by improved bowel regularity, validated by increased stool frequency in healthy adults and by softer stools in healthy infants and children.

Evidence strength: Strong. The prebiotic classification of chicory-derived inulin and oligofructose is supported by multiple well-designed randomised controlled trials and a rigorous systematic review with meta-analysis published in a peer-reviewed journal (Critical Reviews in Food Science and Nutrition, 2022). The reviewers called for additional large randomised clinical trials involving people with different health conditions to "increase our confidence in the present findings."

5.2 Bowel Function and Constipation

A double-blind controlled trial (referenced under Marteau et al., 2011, in Int J Food Sci Nutr) examined the effects of chicory inulin in constipated elderly people. Doses studied in clinical research for high triglycerides have used 10–14 grams of inulin daily; for the treatment of constipation in older people, doses of 20–40 grams per day for 19 days have been used.

The European Food Safety Authority has recognised that "native inulin from chicory root" in doses of at least 12 grams per day helps maintain normal bowel movements.

Evidence strength: Moderate to good for constipation relief and stool frequency in adults; supported by individual RCTs and the EFSA health claim. Effects in IBS may be mixed due to fermentation-related gas and bloating.

5.3 Weight Management

A systematic review in The American Journal of Clinical Nutrition included 32 randomised controlled trials and almost 1,200 participants. Chicory ITF significantly reduced body weight (mean difference: −0.97 kg; 95% CI: −1.34, −0.59; n = 1,184) compared with placebo. This systematic review and meta-analysis of 32 studies showed that the consumption of ITF led to significant reductions in body weight, BMI, fat mass, waist circumference, and, to a certain extent, body fat percentage.

Among the included studies, 14 trials were conducted in participants with overweight or obesity, 5 trials were in participants with type 2 diabetes, 2 trials were in participants with prediabetes, and another 10 trials enrolled healthy individuals or participants with nonalcoholic fatty liver disease, nonalcoholic steatohepatitis, ischemic heart disease, polycystic ovary syndrome, or peritoneal dialysis.

Significant reductions in body weight and body fat mass were seen when adults with overweight or obesity consumed 21 g of oligofructose per day for 12 weeks compared with placebo.

Evidence strength: Moderate. The 2024 meta-analysis in Am J Clin Nutr is the most comprehensive analysis to date. However, the study received funding from the BENEO Institute, a producer of food ingredients including prebiotic fructans and polyols, which represents a potential conflict of interest. Effect sizes are relatively modest, and the population diversity across included trials limits generalisability. The findings contribute to growing evidence for prebiotics, particularly chicory-derived ITF, to positively influence components of weight management.

5.4 Blood Glucose Regulation and Type 2 Diabetes

Replacement of glycaemic carbohydrates by inulin-type fructans from chicory (oligofructose, inulin) reduces the postprandial blood glucose and insulin response to foods, as demonstrated in two double-blind, randomised, controlled trials (Lightowler et al., 2018, European Journal of Nutrition).

A randomised, placebo-controlled trial in 65 females with type 2 diabetes (aged 20–65 years) examined the effects of high-performance inulin supplementation. Type 2 diabetes mellitus females consumed 4 grams of prebiotic inulin daily. Insulin resistance, fasting blood glucose, insulin, and lipid profile were assessed before and after the intervention. The clinical trial demonstrated that, in comparison to measurements taken before supplementation, inulin supplementation considerably decreased fasting blood glucose, serum LDL, triglycerides, total cholesterol, insulin, and insulin resistance levels, and significantly increased HDL.

Forty-six diabetic female patients were randomly allocated into intervention and control groups. Subjects in the intervention group received a daily dose of 10 g of chicory and subjects in the control group received a placebo for two months. The study showed beneficial effects of oligofructose-enriched chicory on the improvement of glucose and calcium homeostasis, liver function tests, blood pressure, and reduction in haematological risk factors of diabetes in female patients with T2DM.

A meta-analysis was conducted to examine the efficiency and safety of inulin for improving insulin control, homeostasis model assessment of insulin resistance (HOMA-IR), and HbA1c in patients with type 2 diabetes mellitus. Databases including Web of Science, PubMed, Embase, and the Cochrane Library were searched for relevant articles published before June 1, 2019. In total, 225 randomised controlled trials regarding the efficiency of inulin for the treatment of type 2 diabetes mellitus were examined.

Evidence strength: Moderate. Multiple small-to-medium RCTs demonstrate improvements in glycaemic markers. The mechanism—reduced postprandial glucose via fibre fermentation bypassing digestion—is well understood. Most individual trials are limited by small samples and predominantly female populations; larger and more diverse trials are needed.

5.5 Lipid Profile

Beneficial health effects reported following ITF intake in clinical trials include decreased triglycerides and an improved lipid profile. Studies reviewed in the RCT meta-analysis for type 2 diabetes also consistently noted improvements in LDL cholesterol and triglycerides alongside glycaemic markers.

Evidence strength: Preliminary to moderate. Evidence comes largely from studies with glycaemic improvement as the primary endpoint, and lipid changes are secondary outcomes. Effects appear most pronounced in individuals with elevated baseline lipids.

5.6 Calcium Absorption and Bone Health

A randomised trial in pubertal adolescents (Abrams et al., 2005) assigned participants to receive 8 g/day of a mixed short- and long-chain inulin-type fructan product or maltodextrin placebo. Calcium absorption was significantly greater in the fructan group than in the control group at 8 weeks (difference: 8.5 ± 1.6%; P < 0.001) and at 1 year (difference: 5.9 ± 2.8%; P = 0.04). After 1 year, the fructan group had a greater increment in both whole-body bone mineral content (difference: 35 ± 16 g; P = 0.03) and whole-body bone mineral density (difference: 0.015 ± 0.004 g/cm²; P = 0.01) than the control group. The authors concluded that daily consumption of a combination of prebiotic short- and long-chain inulin-type fructans significantly increases calcium absorption and enhances bone mineralisation during pubertal growth.

A double-blind, placebo-controlled, crossover trial in 15 postmenopausal women tested a spray-dried mixture of chicory oligofructose and long-chain inulin (Synergy1; SYN1). Fractional absorption of calcium and magnesium increased following SYN1 compared with placebo (P < 0.05). These results suggest that 6 weeks of SYN1 can improve mineral absorption and impact markers of bone turnover in postmenopausal women.

Sustained and sufficient inulin supplementation in adults has a positive effect on calcium metabolism and bone mineral density. It significantly enhances calcium absorption and improves bone health in postmenopausal women and adult men.

Evidence strength: Moderate, with well-designed trials in adolescents and postmenopausal women. The effect on calcium absorption is mechanistically supported by colonic fermentation lowering luminal pH, which promotes passive calcium absorption. Long-term impact on fracture risk has not been evaluated in humans.

5.7 Osteoarthritis

A Phase 1, placebo-controlled, double-blind, dose-escalating trial aimed to determine the safety and tolerability of a proprietary bioactive extract of chicory root in patients with osteoarthritis (OA). Individuals greater than 50 years of age with OA of the hip or knee were eligible. A total of 40 patients were enrolled in 3 cohorts and were treated with escalating chicory doses of 600 mg/day, 1,200 mg/day, and 1,800 mg/day for 1 month. Safety measures in patients treated with either chicory or placebo showed no clinically significant changes between initial and final determinations of vital signs (heart rate, blood pressure) or laboratory measures (CBC, creatinine, AST/ALT) in any of the cohorts.

Evidence strength: Weak/preliminary. This was a Phase 1 safety and dose-finding trial, not powered for efficacy. Only 40 patients were enrolled with a one-month treatment period. Further trials are necessary.

5.8 Liver Health (Hepatoprotection)

Chicory seeds are one of the main ingredients of the commercial Indian product Jigrine, used for the treatment of various diseases of the liver. Other plant parts are also used for liver disorders, namely aerial parts in Bosnia and Herzegovina, and roots in Serbia and India.

In animal models, chicory root extracts have consistently shown hepatoprotective effects. The chicory formulation extract exhibited a remarkable recovery percentage in liver architecture that was higher than silymarin (the reference drug). While treatment with silver nanoparticles also repaired degenerative changes, chicory formulation extract possessed more hepatoprotective potential as compared to silver nanoparticles by regulating biochemical and histopathological parameters. This study supports the hepatoprotective potential of chicory compounds for possible use in the development of drugs to treat liver diseases. However, these findings are from animal experiments.

A multi-herbal liver tonic formula called Liv-52, which contains C. intybus as a component, showed a hepatoprotective effect in cirrhotic patients due to the diuretic, anti-inflammatory, anti-oxidative, and immunomodulating properties of the component herbs. The contribution of chicory specifically within this multi-herb formula cannot be isolated from these results.

Evidence strength: Weak in humans. Most hepatoprotective evidence derives from animal studies and multi-herb combination preparations in which the independent contribution of chicory cannot be assessed. Dedicated human RCTs of chicory alone for liver disease are lacking.

5.9 Cardiovascular Effects

A clinical trial reported that daily consumption of chicory coffee reduced the risk of cardiovascular disorder by lowering whole blood and plasma viscosity as well as serum macrophage migration inhibitory factor (MIF) level, but had a variable effect on platelet aggregation.

Evidence strength: Preliminary. Only one relevant small clinical trial is identified in this area. Findings are consistent with proposed anti-inflammatory mechanisms, but evidence is insufficient to draw conclusions about clinically meaningful cardiovascular outcomes.

6. Body Systems and Health Areas Associated with Chicory

• Gastrointestinal system: Chicory displays choleretic and digestion-promoting, as well as appetite-increasing, anti-inflammatory, and antibacterial action, all owing to its varied phytochemical composition. Hence, chicory is used most often to treat gastrointestinal disorders.
• Gut microbiome: Selective promotion of beneficial bacteria including Bifidobacterium, Lactobacillus, and Faecalibacterium prausnitzii.
• Metabolic system: Blood glucose regulation, lipid profile modulation, weight management.
• Musculoskeletal system: Preliminary evidence for OA symptom management; established evidence in animal models for bone mineral density support via calcium absorption enhancement.
• Hepatic system: Traditionally used and preclinically evidenced as hepatoprotective; clinical evidence in humans remains limited.
• Cardiovascular system: Early clinical evidence for reduction in blood viscosity and MIF.
• Immune system: The phytochemical composition of chicory exhibits pharmacological activities including nematicidal, hypotensive, analgesic, and hepatoprotective properties, and has been used in the treatment of several diseases including diabetes, cancer, viral infections, bacterial infections, and allergic reactions, as well as for its antioxidant property.

7. Dosage Forms and Doses Reported in Studies

Dosage varies substantially depending on the form, constituent, and indication studied. The following reflect doses specifically reported in clinical research or regulatory guidance:

• Inulin/ITF for bowel regularity (EFSA): Native inulin from chicory root in doses of at least 12 grams per day helps maintain normal bowel movements, per EFSA recognition.
• Inulin for gut microflora: Intake of 5–8 g/day of inulin is reported to be sufficient to make a positive effect on the gut microflora.
• Inulin for high triglycerides: The usual dose of inulin studied is 10–14 grams daily.
• Inulin for constipation in older people: 20–40 grams per day for 19 days has been used.
• ITF for adolescent calcium absorption: Pubertal adolescents received 8 g/day of a mixed short- and long-chain degree of polymerization inulin-type fructan product.
• Enriched chicory inulin for type 2 diabetes: Subjects received a daily dose of 10 g of chicory and subjects in the control group received a placebo for two months.
• Oligofructose for weight management: 21 g of oligofructose per day for 12 weeks was used in one well-cited trial showing significant body weight and fat mass reductions.
• Chicory root extract for osteoarthritis: Doses of 600 mg/day, 1,200 mg/day, and 1,800 mg/day were used in 3 escalating cohorts for 1 month each.
• General inulin supplementation: Previous human trials involving inulin have used doses up to 16 g/day for 3 months without serious adverse effects.

8. Safety Considerations

General Safety Status

Chicory is regarded as relatively safe, and inulin (a bioactive compound in chicory) has US Food and Drug Administration (FDA) generally recognized as safe (GRAS) status when consumed in foods.

Gastrointestinal Adverse Effects

Possible side effects of inulin-type fructans intake include gut discomfort due to gas production, reported at doses >20 g/day. Bloating, flatulence, and loose stools are the most commonly reported dose-dependent effects in clinical trials and are consistent with colonic fermentation.

Chicory and inulin are classified as high-FODMAP foods due to their fructan content. Chicory and inulin are a high-FODMAP food as they are high in fructans. This is particularly relevant for individuals with irritable bowel syndrome (IBS), in whom fructan fermentation can exacerbate symptoms.

Allergic Reactions

Contact dermatitis, occupational allergy, asthma, and anaphylaxis have been reported. Like other plants in the Asteraceae family, chicory contains sesquiterpene lactones, which can cause skin irritation and allergic contact dermatitis. Studies have shown chicory contains Bet v 1-like proteins. These are linked to Pollen Food Allergy Syndrome.

If allergic to chicory, individuals may not be able to consume other plants in the Asteraceae family, including artichoke, chamomile, lettuce, tarragon, and sunflower seeds. Cross-reactivity with wormwood and ragweed has been reported in sensitised individuals.

Gallstones

Consumer reference books report that large amounts of herbal chicory may theoretically increase bile secretion, which is undesirable for those with gallstones due to the risk of pain. Although systematic studies are limited, caution and avoidance of large doses of supplements are advisable for those with gallstones.

Pregnancy

Taking chicory by mouth in large amounts is possibly unsafe during pregnancy. Chicory might start menstruation and cause a miscarriage. This concern relates to whole-herb preparations. It is important to distinguish between "inulin as a food component" and "herbal chicory preparations." According to consumer herbal reference books, dietary amounts of inulin are generally considered acceptable, while high doses of whole-herb chicory preparations have not been studied during pregnancy and are potentially undesirable.

Occupational Exposure

Occupational rhinoconjunctivitis and asthma caused by chicory have been documented in workers handling the plant regularly, consistent with its sesquiterpene lactone content and Bet v 1-like protein profile. A case of contact anaphylaxis and protein contact dermatitis in a cook handling chicory leaves has also been reported in the literature (Willi et al., Contact Dermatitis, 2009).

Bioavailability Limitations of Sesquiterpene Lactones

A significant obstacle limiting the pharmacological use of chicory sesquiterpene lactones is their poor aqueous solubility and low oral bioavailability, which may necessitate higher doses and increase systemic toxicity. This is an important consideration for any future pharmaceutical development of these compounds.

Drug Interactions

No major clinically confirmed drug interactions specific to chicory are established in major interaction databases. However, given chicory's potential effects on blood glucose and lipid levels, additive effects with antidiabetic medications and statins are theoretically plausible and warrant attention in clinical contexts. Chicory is not listed by NCCIH among herbs with well-documented pharmacokinetic drug interactions, and formal interaction studies are largely absent from the literature.

References

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