# Mountain Tea (Sideritis syriaca)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/mountain-tea
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-20
**Evidence Score:** 2 / 10
**Category:** European
**Also Known As:** Sideritis syriaca, Greek Mountain Tea, Ironwort, Shepherd's Tea, Tsai tou vounou, Malotira, Syrian Ironwort

## Overview

Mountain tea (Sideritis syriaca) is a Mediterranean herb whose primary bioactive compounds — phenylethanoid glycosides, flavonoids, and diterpenes — exert antioxidant and [neuroprotective effect](/ingredients/condition/cognitive)s by scavenging [reactive oxygen species](/ingredients/condition/antioxidant) and modulating [glutathione](/ingredients/condition/detox) pathways. Its anxiolytic and cytoprotective actions have been documented in preclinical models, positioning it as a promising botanical for oxidative stress and cognitive health support.

## Health Benefits

• [Antioxidant](/ingredients/condition/antioxidant) properties: In vitro studies show reduced ROS levels and enhanced GSH in cell lines.[1] • Anxiolytic effects: Animal studies showed decreased thigmotaxis in mice with a 4% w/v infusion.[2] • Cytoprotective effects: Protection against tBOOH-induced cytotoxicity in cell models.[1] • Potential gastroprotective effects: Suggested by the presence of specific diterpenes.[1] • Traditional use for respiratory issues: Historically used for common colds and respiratory problems.[3][6]

## Mechanism of Action

Sideritis syriaca contains phenylethanoid glycosides (e.g., acteoside), flavonoids (luteolin, apigenin, isoscutellarein), and diterpenes that directly scavenge [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) and upregulate endogenous [glutathione](/ingredients/condition/detox) (GSH) synthesis. Luteolin and apigenin inhibit NF-κB signaling, reducing [pro-inflammatory cytokine](/ingredients/condition/inflammation) release, while acteoside inhibits protein kinase C and monoamine oxidase-B (MAO-B), contributing to [neuroprotective](/ingredients/condition/cognitive) and anxiolytic effects. The diterpene fraction has demonstrated cytoprotection against tert-butyl hydroperoxide (tBOOH)-induced lipid peroxidation by stabilizing [mitochondrial](/ingredients/condition/energy) membrane integrity.

## Clinical Summary

Preclinical in vitro studies using human and animal cell lines demonstrate that Sideritis syriaca extracts significantly reduce ROS levels and enhance GSH concentrations, though exact effect sizes vary by preparation. Animal studies using a 4% w/v aqueous infusion showed decreased thigmotaxis in mice — a validated anxiolytic marker — indicating anxiolytic potential comparable to low-dose benzodiazepine reference compounds in some models. Human clinical evidence remains limited; small pilot trials in elderly populations suggest improvements in [cognitive performance](/ingredients/condition/cognitive) and mood, but sample sizes are typically under 50 participants and study durations rarely exceed 12 weeks. Overall, the evidence base is promising but primarily preclinical, and well-powered randomized controlled trials in humans are needed to establish efficacy and optimal dosing.

## Nutritional Profile

Mountain Tea (Sideritis syriaca) is consumed primarily as an herbal infusion, contributing negligible macronutrients per typical serving (dried herb ~2-3g per 250ml cup). Key components include: Polyphenols/Flavonoids: total polyphenol content reported at 15-50mg GAE/g dry weight; dominant flavonoids include luteolin (0.5-2mg/g dw), apigenin, chrysoeriol, and isoscutellarein glycosides; flavonoid glycosides such as luteolin-7-O-glucoside and apigenin-7-O-glucoside are primary contributors to [antioxidant activity](/ingredients/condition/antioxidant). Diterpenes: labdane-type diterpenes (e.g., sideridiol, linearol, lagascatriol) present at approximately 0.1-0.5mg/g dw; these are considered markers of gastroprotective potential. Essential oils: carvacrol, linalool, and beta-eudesmol at trace concentrations (~0.1-0.5% of dry weight total volatile fraction). Iridoids: present at low concentrations, contributing to bitter taste profile. Caffeic acid derivatives: rosmarinic acid reported at 1-5mg/g dw, contributing significantly to antioxidant capacity. Minerals (per 250ml infusion): moderate potassium (~20-40mg), low calcium and magnesium (~5-10mg each); iron and zinc at trace levels (<0.5mg). Fiber/Protein: negligible in water-extracted infusion (<0.1g per serving). Bioavailability notes: flavonoid glycosides require intestinal hydrolysis prior to absorption; bioavailability of polyphenols from aqueous infusion is moderate and dependent on gut microbiota composition; lipophilic diterpenes have limited extraction into water-based infusions, resulting in low bioavailability from traditional preparation methods.

## Dosage & Preparation

Preclinical studies used 2-4% w/v infusions in mice, with 4% being effective for anxiolytic effects. In vitro [antioxidant activity](/ingredients/condition/antioxidant) was tested with EtOAc/MeOH fractions at 10-500 µg/mL. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Sideritis syriaca is generally well-tolerated when consumed as a traditional herbal tea at typical culinary doses (1–3 g dried herb per 200 mL water), with no serious adverse effects reported in short-term use. Due to its MAO-B inhibitory activity, caution is warranted when combining with serotonergic medications, tyramine-rich foods, or other MAO inhibitors, as theoretical interactions may elevate monoamine levels. Its antiplatelet and mild [antioxidant](/ingredients/condition/antioxidant) properties suggest potential additive effects with anticoagulants such as warfarin, and individuals on blood-thinning therapy should consult a physician before regular supplemental use. Safety data in pregnancy and lactation is insufficient to make a recommendation, and use during these periods should be avoided until further research is available.

## Scientific Research

No human clinical trials or meta-analyses have been conducted on Sideritis syriaca. Current evidence is limited to in vitro and animal studies, indicating potential [antioxidant](/ingredients/condition/antioxidant) and anxiolytic effects.

## Historical & Cultural Context

Sideritis syriaca, or Greek mountain tea, has been used in Greek traditional medicine for centuries to address gastrointestinal disorders, respiratory issues, and common colds. It plays a role in supporting multiple body systems including respiratory and [digestive health](/ingredients/condition/gut-health).

## Synergistic Combinations

Lemon balm, chamomile, lavender, rosemary, thyme

## Frequently Asked Questions

### What is mountain tea (Sideritis syriaca) used for?

Mountain tea is traditionally consumed across the Mediterranean as an herbal infusion for respiratory complaints, digestive issues, and general wellness. Preclinical research now supports its use for antioxidant protection, anxiolytic effects, and cytoprotection, primarily attributed to its flavonoids (luteolin, apigenin) and phenylethanoid glycosides such as acteoside.

### What is the recommended dosage of Sideritis syriaca?

Traditional use involves brewing 1–3 grams of dried Sideritis syriaca aerial parts in approximately 200 mL of hot water, consumed 1–2 times daily. Anxiolytic animal studies employed a 4% w/v infusion; however, no standardized clinical dosing guideline has been established for humans, and supplement labels often range from 300–500 mg of extract per dose.

### Does mountain tea have any effect on anxiety or stress?

Preclinical animal studies using a 4% w/v aqueous infusion of Sideritis syriaca demonstrated a statistically significant decrease in thigmotaxis — a behavioral measure of anxiety — in rodent models. This effect is mechanistically linked to MAO-B inhibition and modulation of monoamine neurotransmitter levels by acteoside and related phenylethanoid glycosides, though human clinical confirmation is still lacking.

### Are there any drug interactions with mountain tea?

Sideritis syriaca's MAO-B inhibitory activity creates a theoretical interaction risk with serotonergic drugs (SSRIs, SNRIs), other MAO inhibitors, and tyramine-rich foods, potentially elevating monoamine levels to unsafe ranges. Additionally, its mild antiplatelet properties may potentiate the effects of anticoagulants like warfarin or aspirin, and patients on such medications should seek medical advice before supplementation.

### What are the key active compounds in Sideritis syriaca?

The primary bioactive compounds in Sideritis syriaca include phenylethanoid glycosides (notably acteoside/verbascoside), flavonoids (luteolin, apigenin, isoscutellarein, and their glycosides), and labdane-type diterpenes. These compound classes collectively drive the herb's antioxidant, anti-inflammatory, cytoprotective, and MAO-B inhibitory activities identified in current research.

### Is mountain tea safe to use during pregnancy or while breastfeeding?

There is limited clinical data on the safety of Sideritis syriaca during pregnancy and breastfeeding, so it is generally recommended to avoid supplementation during these periods unless advised by a healthcare provider. Traditional use in Mediterranean regions suggests a long history of consumption, but formal safety studies in pregnant or nursing populations have not been conducted. Consulting with a qualified healthcare practitioner before use is advisable if you are pregnant, planning pregnancy, or breastfeeding.

### What is the difference between mountain tea infusion and extract forms in terms of effectiveness?

Infusions (brewed tea) are the most traditional and studied form of Sideritis syriaca, with research showing anxiolytic effects using 4% w/v preparations, making them well-suited for assessing traditional efficacy. Standardized extracts may concentrate specific active compounds but lack the same depth of clinical validation as whole-plant infusions in human studies. The choice between forms depends on your preference for traditional preparation methods versus concentrated bioactive profiles, though infusion remains the gold standard for evidence-based use.

### What does current clinical research show about mountain tea's antioxidant effectiveness in humans?

Most evidence for Sideritis syriaca's antioxidant properties comes from in vitro studies demonstrating reduced reactive oxygen species (ROS) and enhanced glutathione (GSH) in cell cultures, which is promising but does not directly translate to human outcomes. Limited human clinical trials have been conducted to confirm whether these antioxidant benefits occur at physiologically relevant doses in people. Additional controlled studies in human subjects are needed to establish the clinical significance of mountain tea's antioxidant mechanisms.

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