# Grindelia (Grindelia robusta)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/grindelia
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-28
**Evidence Score:** 4 / 10
**Category:** Native American
**Also Known As:** Gumweed, Gumplant, Curlycup gumweed, Great Valley gumweed, Rosin weed, Tar weed, Scaly grindelia, August flower, Grindelia squarrosa, Grindelia camporum

## Overview

Grindelia robusta is a medicinal plant containing diterpenes and flavonoids that provides respiratory [inflammation](/ingredients/condition/inflammation) support. Research shows its extract reduces inflammatory cytokines including IL-8, TNF-α, and IL-1β in bronchial epithelial cells at concentrations of 25-100 μg/ml.

## Health Benefits

• Respiratory inflammation support: In vitro studies show Grindelia extract (25-100 μg/ml) reduced inflammatory cytokines (IL-8, TNF-α, IL-1β, IL-6) in nasal/bronchial epithelial cells, comparable to budesonide (preliminary evidence)
• [Anti-inflammatory](/ingredients/condition/inflammation) activity: Preclinical research demonstrates dose-dependent inhibition of inflammatory mediators including IL-6, RANTES, MCP-1, and PGE2 in LPS-stimulated macrophages (preliminary evidence)
• Traditional expectorant properties: Used historically for coughs, bronchitis, and respiratory catarrh, though no clinical trials validate these effects (traditional evidence only)
• Matrix metalloproteinase inhibition: Extract shown to reduce MMPs (-1, -3, -7, -8, -9, -13) in vitro, suggesting potential tissue-protective effects (preliminary evidence)
• NF-κB pathway modulation: Reduces p65 NF-κB activation and TLR-4 expression in immune cells, indicating molecular anti-inflammatory mechanisms (preliminary evidence)

## Mechanism of Action

Grindelia robusta's diterpene compounds inhibit [pro-inflammatory cytokine](/ingredients/condition/inflammation) production including IL-8, TNF-α, IL-1β, and IL-6 in nasal and bronchial epithelial cells. The extract modulates inflammatory pathways in respiratory tissue, demonstrating anti-inflammatory activity comparable to the corticosteroid budesonide. Its flavonoid constituents may contribute additional [antioxidant](/ingredients/condition/antioxidant) effects that support respiratory epithelial cell protection.

## Clinical Summary

Current evidence for Grindelia robusta is limited to preliminary in vitro studies on respiratory [inflammation](/ingredients/condition/inflammation). Laboratory research shows extract concentrations of 25-100 μg/ml significantly reduced inflammatory cytokines in nasal and bronchial epithelial cell cultures, with effects comparable to budesonide treatment. No published human clinical trials have evaluated Grindelia's therapeutic efficacy or safety profile. The existing preclinical data suggests potential for respiratory applications but requires validation through controlled human studies.

## Nutritional Profile

Grindelia (Grindelia robusta) is a medicinal herb, not a significant dietary source of macronutrients or micronutrients; its profile is dominated by bioactive phytochemicals rather than conventional nutritional components. Macronutrient content is negligible in typical medicinal preparations (tinctures, extracts, dried herb). Key bioactive compounds include: (1) Diterpene acids (grindelic acid and related labdane-type diterpenoids, estimated 1-3% of dry weight aerial parts) — the primary resinous constituents responsible for much of its biological activity; (2) Flavonoids including quercetin, luteolin, and kaempferol glycosides (approximately 0.5-2% total flavonoids by dry weight), contributing [antioxidant](/ingredients/condition/antioxidant) and [anti-inflammatory](/ingredients/condition/inflammation) effects; (3) Phenolic acids such as caffeic acid and chlorogenic acid (reported in the range of 0.1-0.5% dry weight); (4) Saponins (triterpenoid type, ~1-2% dry weight); (5) Essential oils containing monoterpenes (borneol, bornyl acetate, limonene) and sesquiterpenes (~0.2-0.5% in aerial parts); (6) Tannins (condensed and hydrolyzable, estimated 2-5% dry weight); (7) Polysaccharides with potential [immunomodulatory](/ingredients/condition/immune-support) properties (quantities not precisely characterized in literature). Mineral content of dried aerial parts includes modest levels of calcium (~500-800 mg/100g dry), potassium (~1000-1500 mg/100g dry), and magnesium (~150-250 mg/100g dry), though these are not nutritionally relevant at medicinal doses. Bioavailability notes: Diterpene acids and flavonoids show moderate oral bioavailability enhanced by the herb's resinous matrix; tincture preparations (ethanol-based, typically 1:5 ratio) improve extraction of lipophilic diterpenes relative to aqueous preparations; standardization of commercial extracts is not yet uniform, limiting precise dosing of active constituents. Data on precise concentrations of individual compounds in standardized extracts remains limited in peer-reviewed literature as of available research.

## Dosage & Preparation

No clinically studied human dosages are available. Preclinical studies used: dry extract (80% ethanol) at 100-200 mg/kg orally in rats; in vitro extracts at 25-100 μg/ml; or 50 μM grindelic acid. Standardization typically targets saponin or polyphenol content. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Safety data for Grindelia robusta supplementation is currently limited due to lack of clinical trials. Traditional use suggests generally good tolerance, but potential side effects, optimal dosing, and long-term safety remain unstudied. No specific drug interactions have been documented, though caution is advised when combining with respiratory medications or [anti-inflammatory](/ingredients/condition/inflammation) drugs. Pregnant and breastfeeding women should avoid use due to insufficient safety data.

## Scientific Research

No controlled human clinical trials, RCTs, or meta-analyses exist for Grindelia robusta or G. squarrosa preparations. Available research consists of in vitro studies including PMID: 33536899 (LPS-stimulated epithelial cells) and PMID: 21031629 (macrophage [inflammation](/ingredients/condition/inflammation) models), plus animal studies showing 41-63% reduction in carrageenan-induced paw edema at 100-200 mg/kg oral doses in rats.

## Historical & Cultural Context

Grindelia robusta/squarrosa has been used in Western herbalism and North American traditional medicine for over a century to treat respiratory conditions including colds, coughs, bronchitis, and catarrh. The European Medicines Agency recognizes its well-established traditional use for respiratory indications based on long-standing experience, though clinical efficacy remains unproven.

## Synergistic Combinations

Thyme, Marshmallow root, Licorice, Eucalyptus, Ivy leaf

## Frequently Asked Questions

### What is the effective dose of grindelia for respiratory inflammation?

In vitro studies used grindelia extract concentrations of 25-100 μg/ml to reduce inflammatory cytokines in respiratory cells. However, no human clinical trials have established safe or effective oral dosing recommendations for grindelia supplementation.

### How does grindelia compare to conventional respiratory treatments?

Laboratory studies show grindelia extract reduced inflammatory cytokines (IL-8, TNF-α, IL-1β, IL-6) with effects comparable to budesonide, a corticosteroid medication. However, these are preliminary in vitro results that have not been validated in human clinical trials.

### What are the main active compounds in grindelia?

Grindelia robusta contains diterpenes as primary bioactive compounds responsible for anti-inflammatory effects. The plant also contains flavonoids that may provide additional antioxidant benefits for respiratory tissue protection.

### Can grindelia be taken with asthma medications?

No documented interactions exist between grindelia and asthma medications, but caution is advised due to limited safety research. Patients should consult healthcare providers before combining grindelia with prescribed respiratory treatments like bronchodilators or corticosteroids.

### Is grindelia safe for long-term use?

Long-term safety of grindelia supplementation has not been studied in clinical trials. While traditional use suggests general tolerance, potential cumulative effects, optimal duration of use, and safety in chronic conditions remain unknown without proper human research.

### What forms of grindelia are available, and which is most effective for respiratory support?

Grindelia is commonly available as liquid extracts, dried herb infusions, and standardized extracts; liquid extracts and tinctures are generally preferred for respiratory use due to better bioavailability of the active resinous compounds. In vitro studies showing inflammatory marker reduction (IL-8, TNF-α) used concentrated extracts at 25-100 μg/ml, suggesting that standardized or concentrated forms may deliver more consistent active compound levels than simple dried preparations.

### Who should avoid grindelia, and are there specific populations at higher risk?

Grindelia is traditionally contraindicated in pregnancy and lactation due to limited safety data, and should be avoided by individuals with allergies to the Asteraceae family (ragweed, chrysanthemums, sunflowers). Those with severe kidney disease or acute respiratory infections requiring immediate medical intervention should consult a healthcare provider before use, as grindelia is intended as a supportive agent rather than an acute treatment.

### What does the current research quality suggest about grindelia's inflammatory effects?

Most evidence for grindelia comes from in vitro (test-tube) studies showing dose-dependent reduction of inflammatory mediators like IL-6, TNF-α, and PGE2, with some preliminary equivalence to corticosteroid budesonide in epithelial cell models. However, high-quality clinical trials in humans are limited, so the strength of evidence is considered preliminary; more randomized controlled studies are needed to establish efficacy and optimal dosing in real-world respiratory conditions.

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