# Feverweed (Eryngium campestre)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/feverweed
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-28
**Evidence Score:** 2 / 10
**Category:** European
**Also Known As:** Eryngium campestre, Field Eryngo, Watling Street Thistle, Blue Devil, Hundred-headed Thistle, Sea Holly

## Overview

Feverweed (Eryngium campestre) is a European thistle-like herb whose bioactive saponins, flavonoids, and phenolic acids drive its documented [antimicrobial](/ingredients/condition/immune-support) and antioxidant effects. These compounds appear to inhibit bacterial cell-wall synthesis and scavenge [reactive oxygen species](/ingredients/condition/antioxidant), underpinning its traditional use in European herbal medicine.

## Health Benefits

• [Antimicrobial](/ingredients/condition/immune-support) activity against Gram-positive bacteria (*in vitro* study)[3].
• Antioxidant effects in diabetic rat models, reducing [oxidative stress](/ingredients/condition/antioxidant)[4].
• [Anti-inflammatory](/ingredients/condition/inflammation) properties observed in animal studies[4].
• Potential antidiabetic effects through modulation of [glucose metabolism](/ingredients/condition/weight-management) in animal models[4].
• Traditional use as an antitussive and diuretic, though not clinically validated[1][2].

## Mechanism of Action

The triterpenoid saponins in Eryngium campestre disrupt bacterial membrane integrity in Gram-positive species by intercalating into lipid bilayers, explaining observed in vitro [antimicrobial](/ingredients/condition/immune-support) activity. Phenolic compounds including luteolin and rosmarinic acid inhibit cyclooxygenase (COX) and lipoxygenase (LOX) enzymes, reducing prostaglandin and leukotriene synthesis to produce [anti-inflammatory](/ingredients/condition/inflammation) effects. Antidiabetic activity is linked to flavonoid-mediated inhibition of alpha-glucosidase and modulation of GLUT-4 translocation, slowing postprandial glucose absorption and improving peripheral glucose uptake in animal models.

## Clinical Summary

Available evidence for Feverweed is limited to in vitro and rodent studies, with no published randomized controlled trials in humans. In vitro assays demonstrated [antimicrobial](/ingredients/condition/immune-support) activity against Gram-positive bacteria including Staphylococcus aureus, though minimum inhibitory concentrations were not consistently reported across studies. Diabetic rat models showed statistically significant reductions in malondialdehyde (MDA) and increases in superoxide dismutase (SOD) activity following Eryngium campestre extract administration, indicating reduced [oxidative stress](/ingredients/condition/antioxidant). [Anti-inflammatory](/ingredients/condition/inflammation) findings in animal models are promising but cannot be extrapolated to human clinical outcomes without further controlled investigation.

## Nutritional Profile

Eryngium campestre (field eryngo/feverweed) has limited formal nutritional analysis in the literature, but the following constituents have been identified and partially quantified: **Bioactive compounds** — saponins (triterpenoid saponins, primarily eryngiumosides, estimated 2–5% dry weight in roots), flavonoids including kaempferol and quercetin glycosides (~0.3–0.8% dry weight in aerial parts), phenolic acids (rosmarinic acid, caffeic acid, chlorogenic acid; total phenolics reported ~15–40 mg GAE/g dry extract in some studies), and essential oils (0.1–0.5% in flowering tops, containing β-caryophyllene, germacrene D, and sabinene as dominant terpenes). **Carbohydrates** — roots are relatively rich in inulin-type fructooligosaccharides and polysaccharides (estimated 10–20% dry weight), contributing to [prebiotic](/ingredients/condition/gut-health) potential. **Fiber** — moderate dietary fiber content consistent with Apiaceae family members, though precise values are unreported. **Minerals** — potassium, calcium, and magnesium are present (specific mg/100g values are unreported in literature); historically documented diuretic use may relate to potassium content. **Vitamins** — vitamin C and small amounts of B-group vitamins are presumed based on botanical family characteristics but have not been formally quantified. **Protein and fat** — both are low; aerial parts likely contain <5% crude protein and <2% lipids on a dry weight basis, consistent with other Apiaceae. **Bioavailability notes** — saponins may reduce absorption of co-administered minerals through chelation; flavonoid glycosides require gut microbial hydrolysis for full bioavailability; the essential oil components are volatile and bioavailability is route-dependent. Most quantitative data derives from organic solvent extracts rather than whole-food analysis.

## Dosage & Preparation

Traditional dosages include 15 drops of tincture three times daily, and decoctions prepared with 20-50 g of root for various effects. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Eryngium campestre has not been evaluated in formal human safety trials, so a comprehensive adverse-effect profile has not been established. Its saponin content may cause gastrointestinal irritation, including nausea or diarrhea, particularly at higher doses, based on the known properties of triterpenoid saponins. Potential interactions with antidiabetic medications (e.g., metformin, sulfonylureas) are plausible given the herb's glucose-lowering activity in animal models, raising hypoglycemia risk if used concurrently. Pregnant and breastfeeding women should avoid use due to the complete absence of safety data in these populations.

## Scientific Research

No human clinical trials or meta-analyses are available for Eryngium campestre. The evidence is limited to in vitro and animal studies, with no PMIDs provided for human subjects.

## Historical & Cultural Context

In European folk medicine, feverweed has been used for respiratory and urinary conditions, as well as gout and rheumatic ailments. It is also employed in Turkish folk remedies as a hypoglycemic agent and antidote.

## Synergistic Combinations

Rosemary, Turmeric, Ginger, Dandelion, Milk Thistle

## Frequently Asked Questions

### What is Feverweed used for in traditional European medicine?

In European herbal tradition, Feverweed (Eryngium campestre) was used primarily as a diuretic, expectorant, and remedy for urinary tract complaints, skin disorders, and febrile conditions. Its roots were the most commonly used plant part, prepared as decoctions or tinctures containing saponins and flavonoids believed to support kidney function and reduce inflammation.

### Does Feverweed have scientifically proven antimicrobial properties?

Yes, in vitro studies have confirmed that Eryngium campestre extracts exhibit antimicrobial activity specifically against Gram-positive bacteria such as Staphylococcus aureus, attributed to membrane-disrupting triterpenoid saponins. However, these findings are preliminary and have not been validated in human clinical trials, so the practical antimicrobial application in humans remains unestablished.

### Can Feverweed help lower blood sugar levels?

Animal studies using diabetic rat models have shown that Eryngium campestre extracts can modulate glucose metabolism, likely through alpha-glucosidase inhibition and GLUT-4 upregulation mediated by its flavonoid constituents. No human clinical trials have been conducted, so it cannot currently be recommended as an antidiabetic intervention, and concurrent use with prescribed antidiabetic drugs carries a theoretical hypoglycemia risk.

### What are the active compounds in Eryngium campestre?

The primary bioactive compounds identified in Eryngium campestre include triterpenoid saponins (notably eryngiumosides), flavonoids such as luteolin and kaempferol, phenolic acids including rosmarinic acid and caffeic acid, and polyacetylenes concentrated mainly in the root. These compounds collectively account for the plant's documented antioxidant, anti-inflammatory, and antimicrobial activities observed in laboratory settings.

### Is Feverweed safe to take as a supplement?

No formal human safety studies exist for Feverweed supplements, making it impossible to define a confirmed safe dosage range. The saponin content poses a risk of gastrointestinal side effects such as nausea and diarrhea, and individuals on antidiabetic or diuretic medications should exercise particular caution due to potential pharmacodynamic interactions. Pregnant women, breastfeeding mothers, and individuals with kidney disease should avoid this herb until safety data become available.

### What is the difference between Feverweed and other Eryngium species used in herbal medicine?

Eryngium campestre (Feverweed) is distinguished from other Eryngium species by its smaller, more delicate flowering heads and specific distribution across European and Mediterranean regions. While other Eryngium species like E. maritimum (Sea Holly) are used in traditional medicine, E. campestre has been traditionally valued specifically for its antitussive and diuretic properties. The active phytochemical profiles may vary between species, potentially affecting their therapeutic applications, though direct comparative clinical studies remain limited.

### Is Feverweed safe to use during pregnancy or while breastfeeding?

There is insufficient clinical evidence to confirm the safety of Feverweed supplementation during pregnancy or breastfeeding, and it should be avoided during these periods as a precaution. Traditional diuretic properties attributed to Feverweed could potentially affect fluid balance in pregnant individuals. Women who are pregnant, planning pregnancy, or breastfeeding should consult a healthcare provider before using Feverweed supplements.

### Does Feverweed interact with diabetes medications or blood sugar-lowering drugs?

While animal studies suggest Feverweed may have antidiabetic effects through glucose metabolism modulation, there are no clinical studies documenting interactions with diabetes medications like metformin or insulin. The potential blood sugar-lowering activity means concurrent use with diabetes drugs could theoretically increase hypoglycemia risk, requiring medical supervision. Individuals taking diabetes medications should consult their healthcare provider before adding Feverweed to their regimen.

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