# Rou Gui Tea (Camellia sinensis)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/rou-gui-tea
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Wuyi Rougui, Wuyi Rock Tea, Rougui Oolong, Cinnamon Tea, Da Hong Pao cultivar, Fujian Rock Tea, Yancha, Camellia sinensis var. Rougui

## Overview

Rou Gui is a Chinese oolong tea cultivar (Camellia sinensis) from the Wuyi Mountains, notable for its exceptionally high catechin content — particularly epigallocatechin gallate (EGCG) at approximately 32.75 mg/g in top-grade leaves. These polyphenols act as [antioxidant](/ingredients/condition/antioxidant)s and may modulate [inflammatory](/ingredients/condition/inflammation) signaling, though no clinical trials have specifically evaluated this cultivar's health outcomes.

## Health Benefits

• Rich in catechins (70-76 mg/g), particularly EGCG at ~32.75 mg/g in top grades - though no clinical trials have evaluated health outcomes for this specific cultivar
• Contains tea polyphenols at 3-4 times the level of soluble sugars - potential [antioxidant](/ingredients/condition/antioxidant) properties remain unstudied in humans
• Provides free amino acids (25.26-25.89 mg/g) including theanine (2.77-3.41 mg/g) - effects on relaxation or cognition not clinically tested
• Processing increases organic acids, alkaloids, and nucleotides - biochemical changes documented but health implications unknown
• Traditional use in Chinese tea culture suggests general wellness benefits - however, no controlled studies validate therapeutic claims

## Mechanism of Action

EGCG, the dominant catechin in Rou Gui tea, inhibits the enzyme catechol-O-methyltransferase (COMT) and suppresses NF-κB signaling, reducing [pro-inflammatory cytokine](/ingredients/condition/inflammation) expression. Tea polyphenols chelate transition metal ions and scavenge [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) directly, protecting lipid membranes from peroxidation. The elevated polyphenol-to-sugar ratio (3–4x) in Rou Gui suggests a particularly high antioxidant capacity relative to glycemic load, though specific receptor binding data for this cultivar remain unpublished.

## Clinical Summary

No clinical trials have been conducted specifically on Rou Gui tea or its extracts as a distinct cultivar; existing evidence is extrapolated from general Camellia sinensis and oolong tea research. Randomized controlled trials on oolong tea polyphenols have used doses of 300–600 mg/day polyphenols in samples of 50–100 participants, reporting modest reductions in LDL oxidation and fasting glucose over 12-week periods. Compositional analyses confirm Rou Gui's catechin profile is quantitatively superior to many commercial oolong varieties, but whether this translates to enhanced clinical outcomes is unknown. The evidence base should be considered preliminary, and health claims specific to this cultivar are not supported by direct human data.

## Nutritional Profile

Rou Gui Tea (Camellia sinensis cv. Rougui) is a Wuyi rock oolong cultivar with a distinctive bioactive compound profile measured per gram of dry leaf. Catechins total 70-76 mg/g, with EGCG (epigallocatechin gallate) as the dominant catechin at approximately 32.75 mg/g in top-grade leaves, followed by EGC, ECG, and EC in lesser concentrations. Total tea polyphenols are present at roughly 3-4 times the concentration of soluble sugars, indicating a polyphenol-dense profile typical of minimally oxidized oolong processing. Free amino acids range from 25.26-25.89 mg/g, with theanine (L-theanine) contributing 2.77-3.41 mg/g — a relatively high theanine fraction that reflects the cultivar's rocky terroir (yancha). Soluble sugars are present at lower concentrations relative to polyphenols, contributing mild sweetness and mouthfeel. Caffeine content is estimated at 20-35 mg per 200ml brewed cup, consistent with oolong-class teas, though cultivar-specific measurements are limited. Mineral content includes trace amounts of fluoride, manganese, potassium, and magnesium, as commonly found in Camellia sinensis leaves grown in mineral-rich Wuyi Mountain soil, though precise Rou Gui-specific mineral assays are not widely published. Fiber and protein contribute minimally to bioavailability in brewed form, as most macromolecular compounds remain in the spent leaf. Bioavailability of catechins from brewed tea is estimated at 20-30% of leaf content, influenced by brewing temperature (90-95°C optimal), steeping time, and water chemistry. The characteristic cinnamon-like aroma is attributed to volatile compounds including trans-cinnamic acid derivatives and linalool, present in trace quantities.

## Dosage & Preparation

No clinically studied dosage ranges are available for Rou Gui Tea. Quality assessments report compositional data per gram of dry tea (e.g., total catechins 70-76 mg/g, caffeine ~25 mg/g), but standardized extracts, powders, or therapeutic dosing have not been established. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Rou Gui tea is generally regarded as safe when consumed in typical culinary quantities (2–4 cups/day), consistent with the safety profile of Camellia sinensis teas broadly. High-dose EGCG supplementation (above 800 mg/day) has been associated with hepatotoxicity in case reports, so concentrated extracts of this cultivar should be used cautiously. Caffeine present in the tea may interact with stimulant medications, anticoagulants like warfarin may be affected by vitamin K content in green tea preparations, and iron absorption can be reduced when tea is consumed with meals due to polyphenol-iron chelation. Pregnant individuals should limit intake to 1–2 cups daily to keep caffeine below 200 mg/day; individuals with liver disease should avoid high-dose extracts.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specific to Rou Gui Tea (Wuyi Rougui) were identified in the research. Available studies focus exclusively on chemical composition, processing effects, and quality grading rather than clinical outcomes, with no PubMed PMIDs available for this cultivar.

## Historical & Cultural Context

Wuyi Rougui has historical roots in Chinese traditional medicine and tea culture within the Wuyi rock tea tradition, prized for its robust aroma and astringency. It is graded by quality markers like phenol-to-amino acid ratios and catechin content, representing a hallmark of Fujian teas used primarily for sensory enjoyment rather than specified medicinal indications.

## Synergistic Combinations

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

## Frequently Asked Questions

### How much EGCG is in Rou Gui tea compared to regular green tea?

Top-grade Rou Gui oolong contains approximately 32.75 mg/g of EGCG, contributing to a total catechin content of 70–76 mg/g. Standard commercial green teas typically contain 10–20 mg/g EGCG, making high-grade Rou Gui meaningfully richer in this specific compound, though oolong processing (partial oxidation) can reduce catechin levels compared to fully unoxidized green tea.

### What is Rou Gui tea and where does it come from?

Rou Gui is a famous rock oolong (yancha) cultivar of Camellia sinensis grown in the Wuyi Mountain region of Fujian Province, China, where mineral-rich soil and high humidity contribute to its distinctive chemical profile. The name translates loosely to 'cinnamon,' referencing its characteristic spicy, woody aroma derived from volatile compounds including nerolidol and geraniol. It is classified as a medium-to-heavily oxidized oolong tea.

### Does Rou Gui tea have more antioxidants than other oolong teas?

Compositional studies show Rou Gui contains tea polyphenols at 3–4 times the concentration of soluble sugars, and its total catechin content of 70–76 mg/g places it at the higher end of reported oolong tea profiles. However, direct comparative human studies between Rou Gui and other oolong cultivars on antioxidant biomarkers (e.g., FRAP, ORAC, plasma EGCG levels) have not been published, so superiority in vivo remains unconfirmed.

### Are there any drug interactions with Rou Gui tea?

The catechins in Rou Gui tea, particularly EGCG, can inhibit intestinal absorption of certain drugs by binding to P-glycoprotein transporters; documented interactions include reduced bioavailability of nadolol (a beta-blocker) when co-administered with green tea catechins. Caffeine in the tea may potentiate stimulants or cause additive cardiovascular effects. Polyphenols can chelate dietary iron and potentially interfere with iron-containing medications; spacing tea consumption 1–2 hours from medications is generally advised.

### How should Rou Gui tea be brewed to preserve its catechin content?

Research on Camellia sinensis brewing indicates that water temperature around 80–90°C (176–194°F) and a steeping time of 2–3 minutes optimally extracts catechins while minimizing bitterness from excess tannin release. Traditional gongfu brewing with short, successive infusions (20–40 seconds each) at higher leaf-to-water ratios (approximately 7–10 g per 100 mL) has been shown to produce higher per-session catechin yields across multiple steepings. Excessively boiling water (100°C) can degrade heat-sensitive catechins and reduce EGCG recovery.

### What is the theanine content in Rou Gui tea and how does it compare to other oolong varieties?

Rou Gui tea contains 2.77–3.41 mg/g of free theanine, an amino acid that may support relaxation. While theanine levels in other oolong teas vary by cultivar and processing, Rou Gui's range falls within the typical spectrum for premium oolong teas, though direct comparative studies remain limited.

### Is Rou Gui tea safe for children and pregnant women?

Rou Gui tea contains caffeine and bioactive compounds that warrant caution during pregnancy; consultation with a healthcare provider is recommended. For children, moderate consumption is generally considered safe, though individual tolerance and sensitivity vary based on age and health status.

### What evidence exists for the health benefits of Rou Gui tea specifically?

While Rou Gui tea is rich in catechins (70–76 mg/g) and polyphenols at levels 3–4 times higher than soluble sugars, no clinical trials have specifically evaluated health outcomes for this cultivar in humans. Research on oolong teas generally suggests antioxidant potential, but benefits specific to Rou Gui remain scientifically unstudied.

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