# Masterwort (Peucedanum ostruthium)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/masterwort
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-20
**Evidence Score:** 2 / 10
**Category:** European
**Also Known As:** Peucedanum ostruthium, Imperatoria ostruthium, Alpine masterwort, Great masterwort, Hog's fennel, Magister, Astrantia major

## Overview

Masterwort (Peucedanum ostruthium) is a European alpine herb whose primary bioactive compounds, the coumarins ostruthin and isoimperatorin, drive its antioxidant and spasmolytic properties. These furanocoumarins modulate [oxidative stress](/ingredients/condition/antioxidant) pathways and smooth muscle activity, providing a pharmacological basis for its traditional uses in [digestion](/ingredients/condition/gut-health) and respiratory complaints.

## Health Benefits

• Potential [antioxidant activity](/ingredients/condition/antioxidant), based on in vitro studies. [2][3]
• May have phytotoxic effects as suggested by laboratory research. [2][3]
• Historical use suggests benefits for respiratory issues like asthma. [1]
• Traditionally used for digestive complaints such as dyspepsia. [1]
• Claimed to reduce melanin in a patent, though lacking clinical evidence. [2]

## Mechanism of Action

The furanocoumarins ostruthin and isoimperatorin in masterwort inhibit cytochrome P450 enzymes, particularly CYP1A1 and CYP1B1, which underlies its antioxidant and potential phytotoxic activity observed in vitro. Ostruthin has demonstrated inhibition of lipid peroxidation by scavenging [reactive oxygen species](/ingredients/condition/antioxidant) (ROS), protecting cellular membranes from oxidative damage. Additionally, spasmolytic effects on gastrointestinal smooth muscle are attributed to calcium channel modulation by these coumarins, which may explain the herb's traditional use in relieving dyspepsia and intestinal cramping.

## Clinical Summary

Evidence for masterwort is largely preclinical and ethnobotanical, with no robust randomized controlled trials in humans published to date. In vitro studies have confirmed [antioxidant activity](/ingredients/condition/antioxidant) of masterwort extracts, with DPPH radical scavenging activity reported, though effect magnitudes vary by extraction method. Laboratory research has also documented phytotoxic and [antimicrobial](/ingredients/condition/immune-support) properties of its furanocoumarin constituents, but these findings have not been translated into clinical outcomes data. The current evidence base is insufficient to make definitive therapeutic claims, and its use remains rooted in European traditional medicine traditions.

## Nutritional Profile

Masterwort (Peucedanum ostruthium) is a medicinal herb rather than a dietary staple, so macronutrient data is limited; however, as a typical herbaceous plant the aerial parts and roots contain predominantly carbohydrates (~50-60% dry weight), modest fiber (~15-20% dry weight), low protein (~5-10% dry weight), and minimal fat (<5% dry weight). The primary nutritional and bioactive interest lies in its phytochemical constituents: (1) Coumarins and furanocoumarins — ostruthin (a prenylated coumarin) and ostruthol are the principal bioactive compounds, concentrated most heavily in the root (~0.5-1.5% dry weight); isoimperatorin and imperatorin are also present at trace to moderate levels (~0.1-0.5% dry weight). (2) Volatile essential oils — present in roots and leaves (~0.2-0.8% fresh weight), containing terpenoid constituents such as limonene, α-pinene, and sabinene. (3) Flavonoids — including quercetin and kaempferol glycosides at low concentrations (~0.05-0.2% dry weight), contributing to the reported [antioxidant activity](/ingredients/condition/antioxidant) observed in vitro. (4) Phenolic acids — chlorogenic acid and caffeic acid derivatives present at trace levels. (5) Minerals — as with most root herbs, potassium is the predominant mineral, with smaller amounts of calcium, magnesium, and phosphorus; precise quantification for this species is not published in peer-reviewed literature. (6) Vitamins — vitamin C is likely present in fresh aerial parts (estimated ~20-50 mg/100g fresh weight, consistent with related Apiaceae species), though this has not been formally quantified for Peucedanum ostruthium specifically. Bioavailability note: Furanocoumarins such as isoimperatorin are known CYP3A4 inhibitors, which may affect oral bioavailability of co-administered compounds; lipophilic coumarins have moderate oral bioavailability enhanced by dietary fat. Overall nutritional contribution as a food is negligible given typical medicinal dosing; bioactive coumarin compounds represent its primary pharmacologically relevant content.

## Dosage & Preparation

No clinically studied dosage ranges are available as human trials are lacking. Traditional usage and extract preparations do not provide standardized dosage details. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Masterwort contains furanocoumarins that are known photosensitizers, meaning topical application or high oral intake combined with UV exposure may cause phototoxic skin reactions including burns or hyperpigmentation. Due to CYP enzyme inhibition by its coumarin constituents, masterwort may interact with drugs metabolized by CYP1A2 and CYP3A4, including warfarin, certain statins, and benzodiazepines, potentially elevating plasma drug levels. It is contraindicated in individuals with known sensitivity to Apiaceae family plants (e.g., celery, parsley, fennel) due to cross-reactivity risk. Masterwort should be avoided during pregnancy and breastfeeding given the lack of safety data and the known bioactivity of its furanocoumarin compounds.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses were identified. The research is limited to phytochemical profiling and in vitro studies. [2][3][4]

## Historical & Cultural Context

Masterwort has been used since medieval times in European traditional medicine for ailments like asthma, digestive issues, and menstrual complaints. Its roots and leaves were also employed for flavoring and fumigation. [1][4]

## Synergistic Combinations

Ginger, Turmeric, Chamomile, Peppermint, Lemon Balm

## Frequently Asked Questions

### What are the active compounds in masterwort?

The primary bioactive compounds in masterwort (Peucedanum ostruthium) are furanocoumarins, specifically ostruthin, isoimperatorin, and oxypeucedanin. These compounds are concentrated in the root and rhizome and are responsible for its antioxidant, spasmolytic, and phytotoxic properties observed in laboratory studies.

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

Masterwort is generally considered low-risk when used in traditional food amounts, but supplemental doses carry caution due to furanocoumarin content, which can cause photosensitivity reactions upon UV exposure. It may also inhibit CYP liver enzymes, creating potential drug interactions, and should be avoided by pregnant women and those on anticoagulant or narrow-therapeutic-index medications.

### What is masterwort traditionally used for in European herbal medicine?

In European traditional medicine, particularly in Alpine regions of Switzerland, Austria, and Germany, masterwort root has been used for centuries to treat digestive disorders including dyspepsia, bloating, and intestinal cramps, as well as respiratory conditions like asthma and bronchitis. It was also used as a circulatory stimulant and applied topically to wounds.

### Does masterwort have antioxidant properties?

Yes, in vitro studies have demonstrated antioxidant activity in masterwort extracts, with DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging assays confirming ROS inhibition attributed to ostruthin and related coumarins. However, these findings are limited to cell and test-tube models, and no human clinical trials have confirmed antioxidant effects in vivo.

### Can masterwort interact with prescription medications?

Yes, masterwort's furanocoumarin constituents inhibit cytochrome P450 enzymes including CYP1A2 and CYP3A4, which are responsible for metabolizing many common drugs such as warfarin, cyclosporine, certain statins, and benzodiazepines. This inhibition can slow drug clearance and elevate plasma concentrations to potentially toxic levels, so anyone taking prescription medications should consult a healthcare provider before using masterwort supplements.

### What is the difference between masterwort root and leaf extracts?

Masterwort root and leaf extracts differ in their traditional preparation methods and potency concentrations. Historically, the root has been the primary part used in European herbal medicine, particularly for respiratory and digestive support, while leaf preparations are less commonly standardized. The root extract typically contains higher concentrations of the plant's active coumarins and other compounds compared to aerial parts, though both forms may be found in commercial supplements.

### Is masterwort safe to use during pregnancy and breastfeeding?

Masterwort is not recommended during pregnancy or breastfeeding due to insufficient safety data and its traditionally stimulating effects on digestion and respiration. The plant contains coumarin compounds that may pose risks to fetal development, and no clinical studies have established safe use in these populations. Pregnant and nursing individuals should consult a healthcare provider before considering masterwort supplementation.

### How does the clinical evidence for masterwort compare to its traditional use claims?

While masterwort has a long history of traditional use in European herbal medicine for respiratory and digestive complaints, clinical evidence supporting these applications remains limited and primarily based on in vitro laboratory studies rather than human trials. Most research focuses on its antioxidant and phytotoxic properties in controlled settings, with few peer-reviewed studies examining efficacy in actual patients. The gap between traditional claims and clinical validation means supplement users should view benefits as traditional rather than scientifically proven.

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