# Rou Gui Oolong (Camellia sinensis 'Rou Gui')

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/rou-gui-oolong
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Camellia sinensis var. Rou Gui, Cinnamon Oolong, Wuyi Rock Tea, 肉桂茶, Yancha, Cinnamon Bark Tea, Fujian Oolong

## Overview

Rou Gui Oolong is a rock tea cultivar of Camellia sinensis containing 15-32 mg/g EGCG and 70.61-75.84 mg/g total catechins. These polyphenolic compounds provide antioxidant activity through [free radical scaveng](/ingredients/condition/antioxidant)ing mechanisms.

## Health Benefits

• No clinical health benefits documented - research focuses exclusively on chemical composition and aroma profiling
• Contains EGCG (15-32 mg/g) and total catechins (70.61-75.84 mg/g dry weight) - compounds associated with [antioxidant](/ingredients/condition/antioxidant) properties in general tea research, though no Rou Gui-specific studies exist
• Rich in theanine (2.77-3.41 mg/g), representing ~40% of amino acids - general tea research suggests relaxation benefits, but no cultivar-specific evidence
• Contains caffeine at unspecified levels - may provide alertness benefits common to tea, though no Rou Gui-specific data available
• Traditional use in Chinese medicine within Wuyi region suggests perceived health value, but no specific therapeutic indications documented

## Mechanism of Action

EGCG and other catechins in Rou Gui Oolong act as potent antioxidants by donating hydrogen atoms to neutralize [free radical](/ingredients/condition/antioxidant)s and chelating metal ions. These polyphenols may also modulate cellular signaling pathways including NF-κB and AP-1 transcription factors. The catechin profile contributes to potential [anti-inflammatory](/ingredients/condition/inflammation) effects through inhibition of cyclooxygenase and lipoxygenase enzymes.

## Clinical Summary

No clinical trials have specifically investigated Rou Gui Oolong's health effects in humans. Current research is limited to chemical composition analysis and aroma profiling studies. While the catechin content suggests potential [antioxidant](/ingredients/condition/antioxidant) benefits based on general tea research, no controlled studies have validated therapeutic applications. The evidence base consists entirely of phytochemical characterization rather than clinical efficacy data.

## Nutritional Profile

Rou Gui Oolong is consumed as a brewed tea infusion, so nutritional content reflects water-soluble compounds extracted during steeping. Macronutrients are negligible in brewed form (calories ~2-5 kcal per 200ml serving, trace protein <0.1g, essentially no fat or carbohydrates in infusion). Bioactive polyphenols are the primary nutritional constituents: total catechins measured at 70.61-75.84 mg/g dry leaf weight, with EGCG (epigallocatechin gallate) at 15-32 mg/g dry weight — notably high for an oolong given partial oxidation typically degrades catechins. EGC (epigallocatechin) and ECG (epicatechin gallate) present in smaller proportions. Total polyphenol content is elevated relative to many oolong cultivars due to Rou Gui's specific genetic profile. Amino acids total approximately 6-8 mg/g dry weight, with L-theanine dominant at 2.77-3.41 mg/g (representing ~40% of total free amino acids); theanine bioavailability from brewed tea is high (~94% absorption). Caffeine content estimated at 20-35 mg/g dry leaf (typical oolong range), yielding approximately 30-60 mg per 200ml brew depending on steeping parameters. Volatile aromatic compounds include trans-nerolidol, geraniol, and cinnamon-characteristic cinnamaldehyde derivatives contributing to its signature spicy aroma profile — these are present in trace microgram-per-gram quantities. Minerals in brewed tea include fluoride (0.1-0.3 mg per cup), manganese (0.4-0.9 mg per cup), and potassium (20-40 mg per cup), consistent with general oolong data; Rou Gui-specific mineral assays are not documented. Vitamin content is negligible post-brewing. Bioavailability note: catechin absorption from oolong is moderately lower than green tea due to partial oxidation forming theaflavin-like polymers, but Rou Gui's retained catechin levels suggest relatively high bioactive polyphenol delivery compared to heavily oxidized oolongs.

## Dosage & Preparation

No clinically studied dosage ranges are available as no human trials exist for this cultivar. Analytical studies report catechin contents in tea samples but without standardization or therapeutic dosing guidelines. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Rou Gui Oolong contains caffeine and may cause [insomnia](/ingredients/condition/sleep), anxiety, or digestive upset in sensitive individuals. The tea may interact with anticoagulant medications due to catechin content affecting platelet aggregation. Excessive consumption could interfere with iron absorption due to tannin content. Pregnant and breastfeeding women should limit intake due to caffeine content.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specific to Rou Gui Oolong were identified in the available research. All studies focus exclusively on chemical composition analysis, aroma profiling, and quality grading methodologies, with no biomedical or therapeutic outcome studies reported.

## Historical & Cultural Context

Rou Gui (meaning 'cinnamon ossicle') Wuyi Rock Tea has historical roots in Chinese traditional medicine within the Wuyi region, valued for its quality graded by polyphenols, caffeine, and catechins. The tea is traditionally prized for its roasted, woody, and cinnamon-like aroma notes enhanced by traditional oolong processing methods.

## Synergistic Combinations

Green tea extract, L-theanine, EGCG, white tea, pu-erh tea

## Frequently Asked Questions

### How much EGCG does Rou Gui Oolong contain?

Rou Gui Oolong contains 15-32 mg of EGCG per gram of dry tea leaves. This represents a moderate level compared to other tea varieties, with total catechins reaching 70.61-75.84 mg/g.

### What makes Rou Gui Oolong different from other oolongs?

Rou Gui Oolong is a specific rock tea cultivar with a distinct chemical profile and cinnamon-like aroma compounds. Its catechin composition and flavor characteristics distinguish it from other oolong varieties grown in different terroir.

### Are there any proven health benefits of Rou Gui Oolong?

No clinical studies have documented specific health benefits of Rou Gui Oolong. Research has focused only on chemical composition analysis, though the catechin content suggests potential antioxidant properties based on general tea research.

### How should Rou Gui Oolong be prepared for maximum benefits?

Optimal brewing typically uses water at 190-200°F for 3-5 minutes to extract catechins effectively. Multiple short steepings may preserve more delicate compounds compared to single long extraction periods.

### Can Rou Gui Oolong interact with medications?

Rou Gui Oolong may interact with blood-thinning medications due to its catechin content affecting platelet function. The caffeine content can also interact with stimulant medications and may reduce effectiveness of certain sedatives.

### What is the origin and growing region of Rou Gui Oolong?

Rou Gui Oolong originates from the Wuyi Mountains (Wuyi Shan) in Fujian Province, China, where it has been cultivated for centuries as a signature rock oolong variety. The name 'Rou Gui' translates to 'cinnamon' in Chinese, referring to the distinctive warm, spiced aroma profile characteristic of teas grown in this specific terroir. The mineral-rich soil and misty mountain climate of the Wuyi region are essential to developing the cultivar's unique sensory characteristics and chemical composition.

### How does Rou Gui Oolong's theanine content compare to other tea types?

Rou Gui Oolong contains approximately 2.77-3.41 mg/g of theanine, which represents about 40% of its total amino acid profile and is notably high compared to many other oolong varieties. Theanine is the same calming amino acid found in green and black teas, though the concentration in Rou Gui is particularly substantial. This elevated theanine content contributes to the tea's characteristic smooth, umami-rich taste and may support relaxation when consumed, independent of its caffeine content.

### What factors affect the quality and chemical composition of Rou Gui Oolong?

The harvest season, oxidation level during processing, and storage conditions significantly influence Rou Gui Oolong's final catechin, EGCG, and theanine concentrations. Traditional roasting methods used by producers can alter the stability and bioavailability of these compounds, with darker roasts potentially reducing some heat-sensitive polyphenols. Proper storage in cool, dry, airtight conditions is essential to preserve the tea's chemical integrity and prevent degradation of active compounds over time.

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