# Qust (Saussurea costus)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/qust
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 4 / 10
**Category:** Middle Eastern
**Also Known As:** Saussurea costus, Qust al-Hindi, Qust al-Bahri, Costus root, Kushtha, Mu Xiang, Snow lotus root, Indian costus

## Overview

Qust (Saussurea costus) is a medicinal herb containing costunolide and dehydrocostus lactone as primary bioactive compounds. It demonstrates [anti-inflammatory](/ingredients/condition/inflammation) activity through NF-κB pathway inhibition and shows [antimicrobial](/ingredients/condition/immune-support) properties against specific pathogens in laboratory studies.

## Health Benefits

• [Anti-inflammatory](/ingredients/condition/inflammation) effects through NF-κB pathway inhibition and reduced nitric oxide production (preliminary in vitro evidence only)
• [Antimicrobial](/ingredients/condition/immune-support) activity showing 16mm inhibition zone against P. aeruginosa and 20mm against C. tropicalis (in vitro nanoparticle studies only)
• Potential anticancer properties via costunolide and dehydrocostus lactone inhibiting hepatitis B surface antigen in Hep3B cells (cell line studies only)
• [Antioxidant protection](/ingredients/condition/antioxidant) through flavonoids and phenolic acids neutralizing free radicals (preclinical evidence only)
• [Hepatoprotective](/ingredients/condition/detox) effects suggested by traditional use and oxidative damage protection (no human clinical data)

## Mechanism of Action

Qust's primary bioactive compounds, costunolide and dehydrocostus lactone, inhibit the nuclear factor kappa B (NF-κB) signaling pathway, reducing [inflammatory](/ingredients/condition/inflammation) cytokine production. These sesquiterpene lactones also suppress nitric oxide synthase activity, decreasing nitric oxide production. The [antimicrobial](/ingredients/condition/immune-support) effects appear to result from membrane disruption and [oxidative stress](/ingredients/condition/antioxidant) induction in bacterial and fungal cells.

## Clinical Summary

Current evidence for Qust is limited to in vitro laboratory studies with no human clinical trials available. [Antimicrobial](/ingredients/condition/immune-support) studies using nanoparticle preparations showed 16mm inhibition zones against Pseudomonas aeruginosa and 20mm against Candida tropicalis. [Anti-inflammatory](/ingredients/condition/inflammation) research has been conducted only in cell culture models, demonstrating NF-κB pathway inhibition. The lack of human studies significantly limits the clinical applicability of these preliminary findings.

## Nutritional Profile

Qust (Saussurea costus) is used primarily as a medicinal herb/spice rather than a staple food, so macronutrient data is limited; however, the following is documented: Moisture content approximately 8-12% in dried root form. Crude fiber estimated at 15-20% of dry weight. Protein content approximately 6-10% of dry weight, with amino acid composition not fully characterized. Fat content low, approximately 1-3% of dry weight, with the essential oil fraction (0.3-2.5% yield by steam distillation) being the primary lipid-soluble component. Carbohydrates constitute the largest macronutrient fraction (~60-65% dry weight), primarily as inulin-type fructooligosaccharides and polysaccharides. Key bioactive sesquiterpene lactones: costunolide (reported at 0.1-1.2% of dry root weight), dehydrocostus lactone (0.05-0.8%), and isodehydrocostus lactone. Cynaropicrin and mokkolactone present in smaller quantities (<0.1%). Essential oil constituents include aplotaxene (~10-15% of oil), α-costene, β-costene, and costuslactone. Phenolic compounds including chlorogenic acid and caffeic acid derivatives present at approximately 0.5-2% of dry weight. Alkaloid fraction (saussurine) documented but concentration data sparse, estimated <0.1% dry weight. Mineral content from limited analyses: iron (~15-25 mg/100g dry weight), calcium (~200-400 mg/100g), potassium (~500-800 mg/100g), with magnesium and zinc present at trace levels. Vitamin data is largely uncharacterized; no reliable quantification of fat-soluble or water-soluble vitamins exists in current literature. Bioavailability note: sesquiterpene lactones show moderate oral bioavailability due to lipophilic nature; co-administration with oils or fats (as in traditional preparation) likely enhances absorption. Inulin-type polysaccharides are largely non-digestible and reach the colon intact, conferring [prebiotic](/ingredients/condition/gut-health) activity.

## Dosage & Preparation

No clinically studied dosage ranges have been established due to the absence of human trials. Traditional preparations include oils and extracts, but lack standardization details for active compounds like costunolide or dehydrocostus lactone. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Safety data for Qust supplementation is extremely limited with no established safe dosage ranges. Traditional use suggests potential gastrointestinal irritation at higher doses, though specific side effects remain undocumented. No known drug interactions have been reported, but caution is advised with anticoagulant medications due to potential bleeding risk. Pregnant and breastfeeding women should avoid use due to insufficient safety data.

## Scientific Research

No human clinical trials, randomized controlled trials (RCTs), or meta-analyses were identified in the available research. All evidence is limited to preclinical pharmacological studies, in vitro assays, and traditional use validations, with no PubMed PMIDs for human studies provided.

## Historical & Cultural Context

Saussurea costus (known as Qust al-Hindi or Qust al-Bahri) has been used for centuries in Ayurveda, Traditional Chinese Medicine, and Tibetan medicine for [anti-inflammatory](/ingredients/condition/inflammation), [antimicrobial](/ingredients/condition/immune-support), digestive, and aromatic purposes. Historical applications primarily employed the roots for treating infections, digestive issues, and as a carminative remedy.

## Synergistic Combinations

Turmeric, Boswellia, Ginger, Black Pepper, Green Tea Extract

## Frequently Asked Questions

### What is the active compound in Qust?

Qust contains costunolide and dehydrocostus lactone as primary bioactive sesquiterpene lactones. These compounds are responsible for the herb's anti-inflammatory and antimicrobial properties demonstrated in laboratory studies.

### Does Qust have proven antimicrobial effects?

Laboratory studies show Qust nanoparticles create 16mm inhibition zones against P. aeruginosa and 20mm against C. tropicalis. However, these are only in vitro studies with no human clinical evidence for antimicrobial effectiveness.

### How does Qust reduce inflammation?

Qust inhibits the NF-κB signaling pathway, which controls inflammatory cytokine production. It also suppresses nitric oxide synthase activity, reducing nitric oxide levels that contribute to inflammatory responses.

### Is Qust safe for daily supplementation?

Safety data for Qust supplementation is insufficient with no established dosage guidelines. Traditional use suggests possible gastrointestinal irritation, and pregnant women should avoid use due to lack of safety studies.

### What conditions is Qust traditionally used for?

In Unani medicine, Qust is traditionally used for respiratory conditions, digestive disorders, and inflammatory conditions. However, these traditional uses lack modern clinical validation and remain unproven by scientific standards.

### What is the current quality of scientific evidence for Qust's health benefits?

Most research on Qust consists of in vitro and preliminary studies rather than human clinical trials, meaning effects shown in lab settings have not yet been confirmed in people. While traditional use in Ayurvedic and Unani medicine spans centuries, modern scientific validation remains limited to small-scale studies on isolated compounds like costunolide. The antimicrobial and anti-inflammatory mechanisms identified are promising but require rigorous clinical testing before definitive health claims can be made.

### Who should avoid taking Qust supplements?

Pregnant and nursing women should avoid Qust due to insufficient safety data in these populations and traditional use as an emmenagogue. Individuals with allergies to plants in the Asteraceae family (such as ragweed, chrysanthemums, or daisies) may experience cross-reactivity and should consult a healthcare provider. Those taking immunosuppressants or with hepatitis B-related conditions should seek medical guidance before use, given preliminary research suggesting potential effects on viral antigens.

### What forms of Qust are available, and does the form affect its effectiveness?

Qust is available as dried root powder, traditional decoctions, standardized extracts, and in nanoparticle formulations used primarily in research settings. The standardized extract and nanoparticle forms show enhanced bioavailability in laboratory studies compared to whole plant material, though clinical evidence comparing forms in humans is lacking. Traditional preparation methods and extract standardization can significantly influence the concentration of active compounds like costunolide, making product quality and sourcing important factors.

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