# Tieguanyin (Camellia sinensis)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/tieguanyin
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Iron Goddess of Mercy tea, Iron Buddha tea, Anxi Tieguanyin, Ti Kuan Yin, Tie Guan Yin oolong, Iron Goddess oolong, TGY tea, 观音茶

## Overview

Tieguanyin is a premium oolong tea cultivar (Camellia sinensis) rich in polyphenols, particularly EGCG and other catechins. These compounds provide antioxidant activity through [free radical scaveng](/ingredients/condition/antioxidant)ing and may support [cardiovascular health](/ingredients/condition/heart-health).

## Health Benefits

• Limited clinical evidence available - no human trials specifically on Tieguanyin cultivar identified in research
• Contains catechins (EGCG, ECG, EGC, EC) known from general tea studies to have [antioxidant](/ingredients/condition/antioxidant) properties - evidence quality: traditional/theoretical
• Rich in polyphenols (up to 50% yield via extraction) - evidence quality: laboratory analysis only
• Traditional use for promoting vitality and [digestion](/ingredients/condition/gut-health) in Chinese medicine since 18th century - evidence quality: historical/traditional
• Contains volatile compounds like nerolidol (12.08%) contributing to potential aromatherapeutic effects - evidence quality: chemical analysis only

## Mechanism of Action

Tieguanyin's catechins, particularly EGCG (epigallocatechin gallate), neutralize [reactive oxygen species](/ingredients/condition/antioxidant) through direct free radical scavenging mechanisms. These polyphenols also modulate antioxidant enzyme pathways including [glutathione](/ingredients/condition/detox) peroxidase and superoxide dismutase. The semi-fermentation process unique to oolong cultivation creates a distinct catechin profile compared to green or black teas.

## Clinical Summary

No human clinical trials have specifically investigated Tieguanyin cultivar effects. General oolong tea studies show modest benefits for weight management and lipid profiles in small trials of 50-100 participants. Most evidence comes from in vitro studies demonstrating [antioxidant](/ingredients/condition/antioxidant) capacity of Tieguanyin polyphenol extracts. Current evidence quality is limited and primarily theoretical based on compound analysis.

## Nutritional Profile

Tieguanyin (Camellia sinensis) is consumed primarily as a brewed tea infusion, so nutritional content reflects both dry leaf composition and infusion yields. DRY LEAF COMPOSITION: Total polyphenols 15–25% dry weight (heavily oxidized oolong; less than green tea's 30–35%); catechins 8–15% dry weight (partial oxidation reduces catechin content vs. green tea), comprising EGCG (~3–6% dry weight), ECG (~2–4%), EGC (~1–2%), EC (~0.5–1%); theaflavins and thearubigins formed during partial oxidation (~2–5% combined); flavonols including quercetin, kaempferol, myricetin glycosides (~0.5–1%); caffeine 2–4% dry weight; theanine (L-theanine) 1–2% dry weight; chlorophyll and carotenoids trace amounts. MINERALS (dry leaf): Manganese 300–600 mg/100g (notably high, bioavailability in infusion ~10–15%); fluoride 100–400 mg/100g dry leaf; potassium ~2000 mg/100g; calcium ~400 mg/100g; magnesium ~200 mg/100g; zinc ~3–5 mg/100g. VITAMINS (dry leaf): Vitamin C trace to 50 mg/100g (substantially degraded during oolong oxidation and hot water brewing); Vitamin K1 ~700–900 mcg/100g dry leaf; B-vitamins including riboflavin ~1 mg/100g, niacin ~5 mg/100g. BREWED INFUSION (per 240 mL, ~2g dry leaf, 90°C, 3-minute steep): Catechins total ~50–120 mg per cup (lower than green tea due to oxidation); EGCG ~20–60 mg; caffeine ~30–60 mg; L-theanine ~10–25 mg; calories ~2–5 kcal; protein negligible (<0.1g); carbohydrates <0.5g; fat negligible. BIOAVAILABILITY NOTES: Catechin absorption from oolong is estimated at 5–25% of ingested dose; co-consumption with milk reduces polyphenol bioavailability by ~25–30% due to protein binding; L-theanine bioavailability is high (~95%); manganese from tea infusion contributes meaningfully to daily intake given low food-based manganese bioavailability; fluoride bioavailability from tea infusion is approximately 85–90%, representing a meaningful dietary source with regular consumption; polyphenol extraction efficiency favors multiple short steeps (gongfu style) over single long steeps, yielding up to 50% total polyphenol extraction across 3–4 infusions.

## Dosage & Preparation

No clinically studied dosage ranges for Tieguanyin have been established due to lack of human trials. Traditional preparation involves brewing at 1:50 tea-to-water ratio at 30-80°C for optimal catechin extraction, though these are not validated clinical doses. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Tieguanyin contains 30-50mg caffeine per cup, which may cause [insomnia](/ingredients/condition/sleep) or anxiety in sensitive individuals. Tea catechins can reduce iron absorption when consumed with meals containing non-heme iron. May interact with anticoagulant medications due to vitamin K content. Generally recognized as safe for healthy adults, but pregnant women should limit intake to 1-2 cups daily due to caffeine content.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specifically on Tieguanyin were identified in the research. While general Camellia sinensis studies exist on catechins like EGCG, none differentiate Tieguanyin cultivar effects, with available research focusing solely on extraction methods, volatile compounds, and processing techniques rather than clinical outcomes.

## Historical & Cultural Context

Tieguanyin has been cultivated in Fujian Province since the 18th century Qing Dynasty, named after the 'Iron Goddess of Mercy.' Its traditional processing emphasizes hand-shaking techniques aligned with Traditional Chinese Medicine principles of balancing qi, used historically for promoting vitality and supporting [digestion](/ingredients/condition/gut-health).

## Synergistic Combinations

Green tea extract, L-theanine, Quercetin, Vitamin C, White tea extract

## Frequently Asked Questions

### How much EGCG is in Tieguanyin tea?

Tieguanyin contains approximately 15-25mg EGCG per cup, which is lower than green tea but higher than black tea. The semi-fermentation process reduces catechin content compared to unfermented green tea varieties.

### What makes Tieguanyin different from other oolong teas?

Tieguanyin is a specific cultivar grown primarily in Fujian Province with a unique roasting process that creates higher polyphenol retention. It contains up to 50% polyphenol yield compared to 20-30% in other oolong varieties.

### Can Tieguanyin help with weight loss?

Limited studies on oolong teas suggest modest metabolic benefits, but no specific weight loss trials exist for Tieguanyin cultivar. Any effects would likely be minimal and require consistent daily consumption of 2-3 cups.

### Is Tieguanyin safe to drink daily?

Yes, 2-3 cups daily is generally safe for healthy adults. However, the caffeine content may cause side effects in sensitive individuals, and tea should be consumed between meals to avoid iron absorption interference.

### Does Tieguanyin have more antioxidants than green tea?

Tieguanyin has moderate antioxidant levels between green and black tea due to partial fermentation. While it contains beneficial catechins, green tea typically has higher EGCG concentrations per serving.

### What is the difference between Tieguanyin tea and Tieguanyin supplements or extracts?

Tieguanyin tea refers to the traditional brewed leaf form, while supplements and extracts concentrate the polyphenols and catechins into powder or capsule formats for higher doses. Extracts typically contain up to 50% polyphenol yield through laboratory processing, whereas brewed tea delivers these compounds at lower but naturally balanced concentrations. The bioavailability and absorption rates may differ between whole leaf infusions and concentrated extracts due to the presence of other tea compounds that may aid or inhibit absorption.

### Is Tieguanyin safe for pregnant women or children to consume?

While Tieguanyin tea is generally recognized as safe for regular consumption, pregnant women should consult a healthcare provider about caffeine intake, as Tieguanyin contains moderate caffeine levels that may affect pregnancy outcomes. For children, diluted Tieguanyin tea in small amounts is typically considered safe, but concentrated supplements are not recommended without pediatric guidance. Elderly individuals generally tolerate Tieguanyin well, though those with caffeine sensitivity should limit intake or choose naturally decaffeinated versions.

### Does Tieguanyin interact with medications like blood thinners or stimulants?

Tieguanyin contains catechins that may have mild interactions with blood-thinning medications like warfarin due to its vitamin K content, though the risk from tea consumption is typically low compared to supplements. Its caffeine content could potentially amplify effects of stimulant medications or increase cardiovascular effects when combined with certain drugs. Anyone taking prescription medications should consult with a healthcare provider before significantly increasing Tieguanyin consumption, particularly in concentrated supplement form.

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