# Coltsfoot Leaf (Tussilago farfara)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/coltsfoot-leaf
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-20
**Evidence Score:** 2 / 10
**Category:** European
**Also Known As:** Tussilago farfara, Coughwort, Horsehoof, Foalswort, Butterbur leaf, Son-before-father, 款冬花 (Kuan Dong Hua), Bull's foot

## Overview

Coltsfoot leaf (Tussilago farfara) contains key bioactives including tussilagone, flavonoids such as quercetin and kaempferol, and phenolic acids like chlorogenic acid. These compounds exhibit [antimicrobial](/ingredients/condition/immune-support), [anti-inflammatory](/ingredients/condition/inflammation), and antioxidant activity primarily through inhibition of pro-inflammatory mediators and [free radical scaveng](/ingredients/condition/antioxidant)ing in preclinical models.

## Health Benefits

• Exhibits [antimicrobial](/ingredients/condition/immune-support) activity against gram-negative bacteria (preclinical studies).[2] • Contains flavonoids with potential [anti-inflammatory](/ingredients/condition/inflammation) properties (inferred from phytochemistry).[1][2] • May provide [antioxidant](/ingredients/condition/antioxidant) effects through phenolic acids (preclinical evidence).[1][4] • Historical use suggests benefits for respiratory issues and cough treatment (traditional use).[1][3][5] • Potential to modulate inflammation via sesquiterpenes (preclinical studies).[3]

## Mechanism of Action

Tussilagone, a sesquiterpene ester found in coltsfoot, has been shown to inhibit platelet-activating factor (PAF) receptors and suppress NF-κB signaling, reducing downstream production of [pro-inflammatory cytokine](/ingredients/condition/inflammation)s such as TNF-α and IL-6. Flavonoids including quercetin and kaempferol inhibit cyclooxygenase (COX) enzymes and lipoxygenase (LOX) pathways, dampening prostaglandin and leukotriene synthesis. Chlorogenic acid and other phenolic acids scavenge [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) and chelate metal ions, contributing to the observed antioxidant activity in cell-based assays.

## Clinical Summary

The evidence base for coltsfoot leaf in humans is extremely limited, with no well-designed randomized controlled trials establishing efficacy for any indication. Most available data derives from in vitro cell studies and small animal models demonstrating [antimicrobial](/ingredients/condition/immune-support) effects against gram-negative bacteria and [anti-inflammatory](/ingredients/condition/inflammation) activity. Traditional ethnobotanical use across European and Asian cultures for respiratory complaints, including coughs and bronchitis, predates modern clinical investigation but does not substitute for controlled evidence. The herb's pyrrolizidine alkaloid (PA) content, particularly senkirkine and senecionine, has prompted regulatory restrictions in multiple countries, making formal human trials ethically complex.

## Nutritional Profile

Coltsfoot leaf (Tussilago farfara) is not a significant dietary source of macronutrients but contains a range of bioactive phytochemicals. Moisture content in fresh leaves is approximately 80–85%. Dried leaf material contains modest fiber (~10–15% by dry weight), minimal protein (~5–8% dry weight), and negligible fat. Key bioactive compounds include: (1) Pyrrolizidine alkaloids (PAs) — senkirkine and senecionine are the primary hepatotoxic PAs, typically present at 0.015–0.06 mg/g in dried leaf material, with concentrations varying significantly by plant part and growth stage (flowers and roots contain higher levels than leaves); bioavailability is high via oral route with first-pass hepatic [metabolism](/ingredients/condition/weight-management) generating toxic pyrrole intermediates. (2) Flavonoids — quercetin, kaempferol, and their glycosides (rutin, hyperoside) present at approximately 0.5–1.5% dry weight; isorhamnetin glycosides also identified; moderate bioavailability enhanced by gut microbial deglycosylation. (3) Phenolic acids — caffeic acid, chlorogenic acid, and 3,5-dicaffeoylquinic acid (cynarin-like compounds) at roughly 1–3% dry weight; chlorogenic acid estimated at 0.8–2.0 mg/g dried leaf; moderate bioavailability via passive absorption in small intestine. (4) Mucilaginous polysaccharides — polysaccharide fraction comprising arabinogalactans and fructans at approximately 7–8% dry weight; these contribute to demulcent/soothing properties; limited systemic bioavailability but locally active in mucous membranes. (5) Terpenes and sterols — tussilagone (a sesquiterpene) identified as a key active compound; sitosterol and other phytosterols present in minor amounts (<0.1% dry weight). (6) Minerals — potassium is the predominant mineral (~15–20 mg/g dry weight), followed by calcium (~8–12 mg/g), magnesium (~2–4 mg/g), and zinc in trace amounts; iron content approximately 0.1–0.3 mg/g dry weight. (7) Vitamins — vitamin C reported at approximately 5–15 mg/100 g fresh weight; traces of vitamin E (tocopherols) present but not at nutritionally significant levels. (8) Tannins — approximately 5% dry weight, primarily hydrolyzable tannins, contributing to astringent properties with limited systemic absorption. Overall nutritional contribution as a food source is negligible; the plant is used primarily for its phytochemical bioactivity. The presence of hepatotoxic PAs significantly limits safe consumption, and many regulatory bodies (e.g., German Commission E, HMPC/EMA) restrict or advise against internal use of PA-containing preparations.

## Dosage & Preparation

No clinically studied dosage ranges are available due to the lack of human trials. Traditional use lacks standardization details. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Coltsfoot leaf contains hepatotoxic pyrrolizidine alkaloids (PAs), specifically senkirkine and senecionine, which are metabolized by hepatic CYP3A4 enzymes into toxic pyrrole derivatives capable of causing veno-occlusive liver disease with chronic exposure. It is contraindicated in pregnancy and lactation due to potential embryotoxic and genotoxic effects of PAs, and should be avoided in individuals with pre-existing liver disease or those taking hepatotoxic medications. Potential interactions exist with anticoagulants such as warfarin, as tussilagone's PAF-inhibiting activity may potentiate bleeding risk. Germany's Commission E and the European Medicines Agency have restricted or advised against internal use of PA-containing coltsfoot preparations, and products should be PA-free if used at all.

## Scientific Research

No key human clinical trials or meta-analyses are available for coltsfoot leaf. Research is limited to preclinical studies on its phytochemistry and in vitro effects. No PubMed PMIDs are reported for RCTs.

## Historical & Cultural Context

Coltsfoot leaf has been traditionally used in European herbalism and Asian systems like Traditional Chinese Medicine for treating coughs, respiratory issues, and [inflammation](/ingredients/condition/inflammation). Historical applications also include diabetes and as a uterine stimulant.

## Synergistic Combinations

Elderberry, Echinacea, Licorice Root, Mullein, Marshmallow Root

## Frequently Asked Questions

### Is coltsfoot leaf safe to consume as a tea or supplement?

Coltsfoot leaf is not considered safe for internal consumption in its unprocessed form due to the presence of pyrrolizidine alkaloids (PAs) like senkirkine, which are hepatotoxic and potentially carcinogenic. Germany's Commission E withdrew approval for internal use in 1992, and only PA-free certified preparations are considered for limited use in some European countries. Long-term or high-dose ingestion significantly increases the risk of liver damage, including veno-occlusive disease.

### What is tussilagone and what does it do?

Tussilagone is a sesquiterpene ester and one of the primary bioactive compounds in Tussilago farfara, identified as a potent inhibitor of platelet-activating factor (PAF) receptors in preclinical studies. By blocking PAF signaling, tussilagone suppresses inflammatory cascades involving NF-κB activation and reduces cytokine output including TNF-α and IL-6. These effects have been demonstrated in vitro and in rodent models but have not been confirmed in human clinical trials.

### What bacteria does coltsfoot leaf work against?

Preclinical in vitro studies have shown coltsfoot leaf extracts exhibit antimicrobial activity against several gram-negative bacteria, including strains of Pseudomonas aeruginosa and Escherichia coli, likely mediated through its phenolic acid content including chlorogenic and caffeic acids disrupting bacterial cell membranes. Activity against some gram-positive organisms has also been observed, though results vary by extraction method and solvent. No human clinical data exists to translate these findings into therapeutic recommendations.

### Why was coltsfoot historically used for coughs and respiratory issues?

Coltsfoot has been used in European and Chinese traditional medicine for centuries as an expectorant and antitussive, with references appearing in texts by Dioscorides and later in Nicholas Culpeper's 17th-century herbal writings. The mucilage content of the leaf, along with tussilagone's anti-spasmodic properties, is theorized to soothe irritated bronchial mucosa and reduce cough reflex sensitivity. However, this historical use predates modern pharmacovigilance, and the hepatotoxic PA content now renders traditional preparations unacceptable by contemporary safety standards.

### Are there PA-free coltsfoot products and are they safer?

Some manufacturers produce PA-free coltsfoot preparations through specific extraction and purification processes designed to remove pyrrolizidine alkaloids below detectable thresholds (typically under 1 mcg/day per European Herbal Pharmacopoeia guidance). These products are considered to carry substantially lower hepatotoxicity risk, though long-term safety data for PA-free coltsfoot specifically remains limited. Consumers should verify third-party testing certificates and look for compliance with European Pharmacopoeia PA limits before considering any internal use.

### What is the difference between coltsfoot leaf extract and coltsfoot flower, and which is more commonly used in supplements?

Coltsfoot leaf and flower come from the same plant but are harvested at different times, with the flower appearing before leaves in spring. Leaf extracts are more commonly used in commercial supplements and traditional preparations, particularly for respiratory support. The leaf contains higher concentrations of flavonoids and phenolic acids compared to the flower, making it the preferred form in most herbal formulations.

### Does coltsfoot leaf interact with common cough medications or bronchodilators?

Limited clinical data exists on direct drug interactions between coltsfoot leaf and cough suppressants or bronchodilators, though additive effects are theoretically possible. Individuals taking prescription respiratory medications should consult a healthcare provider before adding coltsfoot supplements, as the herb's traditional use for cough relief could potentiate pharmaceutical effects. No major interactions have been documented in published literature, but individual variation in response warrants caution.

### How does coltsfoot leaf's antimicrobial activity compare to other traditional respiratory herbs like thyme or horehound?

While coltsfoot demonstrates antimicrobial activity against gram-negative bacteria in preclinical studies, direct comparative research with thyme or horehound is limited. Thyme and horehound have stronger evidence bases from clinical trials, whereas coltsfoot's antimicrobial data primarily comes from laboratory studies rather than human trials. Each herb offers overlapping but distinct phytochemical profiles—coltsfoot emphasizes flavonoids and phenolic acids, while thyme is rich in thymol and carvacrol, making them useful as complementary rather than interchangeable options.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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