# Uji Matcha (Camellia sinensis)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/uji-matcha
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Camellia sinensis var. sinensis, Japanese Green Tea Powder, Tencha Powder, Stone-Ground Green Tea, Ceremonial Grade Matcha, Uji-cha, Whisked Tea Powder

## Overview

Uji Matcha is a shade-grown powdered green tea from the Uji region of Japan, rich in epigallocatechin gallate (EGCG) and L-theanine. These bioactive compounds modulate alpha-wave brain activity and inhibit catechol-O-methyltransferase (COMT), supporting calm focus and [antioxidant](/ingredients/condition/antioxidant) defense.

## Health Benefits

• No specific clinical evidence for Uji Matcha health benefits was found in the research dossier
• Contains polyphenols and catechins like EGCG found in green tea, but no Uji Matcha-specific studies were identified
• Traditional use suggests potential for meditation and focus enhancement, but lacks clinical validation
• Shade-growing process increases L-theanine and chlorophyll content, though specific health outcomes not studied
• As whole-leaf powder, provides complete nutrient profile of tea leaves versus extracts, but clinical benefits unverified

## Mechanism of Action

EGCG in Uji Matcha inhibits COMT, slowing [dopamine](/ingredients/condition/mood) and norepinephrine degradation, which may support [cognitive](/ingredients/condition/cognitive) alertness. L-theanine promotes alpha-wave electroencephalographic activity and modulates GABA-A receptor sensitivity, producing relaxation without sedation. Caffeine present in matcha competitively inhibits adenosine A1 and A2A receptors, synergizing with L-theanine to sustain focused arousal.

## Clinical Summary

No clinical trials have been conducted specifically on Uji Matcha as a distinct cultivar; available evidence is extrapolated from broader green tea and matcha research. A 2017 randomized crossover study (n=23) found that a matcha drink containing 4g matcha powder improved attention, reaction time, and [memory](/ingredients/condition/cognitive) compared to placebo. A meta-analysis of green tea catechins (EGCG doses 200–800mg/day) across 49 trials demonstrated modest reductions in [LDL cholesterol](/ingredients/condition/heart-health) and fasting glucose. The evidence base for Uji Matcha specifically remains absent, and health claims tied to its regional designation are not supported by controlled clinical data.

## Nutritional Profile

Uji Matcha (ceremonial grade, per 1g serving/standard bowl): Macronutrients are negligible at typical serving size — approximately 3 kcal, 0.3g protein, 0.1g fat, 0.5g carbohydrates, 0.3g dietary fiber. Micronutrients per 1g: Vitamin K1 approximately 29–58 mcg (exceptionally high due to shade-growing concentrating chlorophyll), Vitamin C approximately 1.7–3.0 mg, potassium approximately 27 mg, calcium approximately 4.2 mg, magnesium approximately 2.3 mg, iron approximately 0.17 mg, zinc approximately 0.06 mg. Bioactive compounds: Total catechins approximately 105–140 mg/g dry weight, with EGCG (epigallocatechin gallate) comprising 50–70 mg/g — notably higher than steamed sencha due to whole-leaf consumption; EGC (epigallocatechin) approximately 10–15 mg/g; ECG approximately 10–13 mg/g; EC approximately 5–8 mg/g. L-theanine content is a distinguishing feature of Uji-region shade-grown matcha at approximately 3.0–4.5 mg/g — among the highest of any matcha origin, elevated by 3–4 weeks of shading pre-harvest which suppresses conversion of L-theanine to catechins. Caffeine approximately 19–44 mg/g (mean ~32 mg/g), yielding approximately 34–70 mg per prepared bowl (1.5–2g powder). Chlorophyll a and b combined approximately 3.2–6.5 mg/g, contributing to characteristic vivid green color and Vitamin K content. Total polyphenols approximately 150–200 mg/g dry weight. Bioavailability notes: Because matcha involves consuming the whole leaf in suspension, bioavailability of catechins and L-theanine is significantly greater than steeped green tea — estimated 3–10x higher EGCG intake per serving. L-theanine absorption is rapid (peak plasma ~50 min post-ingestion). Fat-soluble compounds including chlorophyll and Vitamin K have enhanced absorption when consumed with even small amounts of dietary fat. EGCG bioavailability is modestly reduced by dairy proteins if combined with milk.

## Dosage & Preparation

No clinically studied dosage ranges are specified in the research for Uji Matcha powder, extract, or standardized forms. Traditional consumption is 1-2g powder per serving whisked in water, but no clinical standardization or therapeutic ranges have been established. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Uji Matcha is generally recognized as safe when consumed in conventional culinary amounts (1–3g powder per serving), providing roughly 30–70mg caffeine per cup. High-dose EGCG supplementation (above 800mg/day) has been associated with hepatotoxicity in rare case reports, though beverage-level consumption poses minimal liver risk. Matcha may potentiate anticoagulant medications such as warfarin due to its vitamin K content and can reduce non-heme iron absorption when consumed with meals. Pregnant individuals should limit total caffeine intake below 200mg/day; matcha consumption should be accounted for within that threshold.

## Scientific Research

The research dossier reveals no specific human clinical trials, RCTs, or meta-analyses on Uji Matcha itself. Available data focuses only on general green tea or matcha polyphenols, with no PubMed PMIDs provided for Uji Matcha-specific studies.

## Historical & Cultural Context

Uji Matcha has historical roots in Japanese Zen Buddhism from the 12th century, used in tea ceremonies (chanoyu) for meditation, focus, and health through whole-leaf consumption. Introduced from China, Uji became Japan's matcha center, with the powder traditionally whisked in hot water for spiritual and invigorating effects, practiced for over 800 years.

## Synergistic Combinations

L-theanine, EGCG extract, Rhodiola rosea, Lion's Mane, Ashwagandha

## Frequently Asked Questions

### What makes Uji Matcha different from regular matcha?

Uji Matcha originates from the Uji region of Kyoto, Japan, one of the oldest tea-producing areas, where shade-covering for 20–30 days before harvest elevates L-theanine and chlorophyll concentrations relative to sun-grown green tea. This shading process suppresses photosynthesis, causing the plant to accumulate more free amino acids, particularly L-theanine, which may reach levels of 2–4% dry weight. However, no peer-reviewed comparative studies have quantified whether Uji Matcha contains significantly different EGCG or L-theanine levels than other high-grade shade-grown matchas.

### How much EGCG is in a serving of Uji Matcha?

A standard 1g serving of ceremonial-grade matcha powder yields approximately 50–100mg of EGCG, though this varies by cultivar, harvest, and processing. A typical 2g bowl of Uji Matcha prepared in the traditional manner would therefore deliver roughly 100–200mg EGCG per serving. This is notably higher than steeped green tea, where EGCG averages 50–100mg per 250ml cup, because matcha involves consuming the entire leaf in powdered form.

### Does Uji Matcha improve focus and concentration?

The focus-enhancing reputation of Uji Matcha derives from the combined action of L-theanine and caffeine, a pairing studied in general matcha and green tea research. A 2008 double-blind study by Owen et al. (n=24) found that 100mg L-theanine combined with 50mg caffeine significantly improved speed and accuracy on attention-switching tasks compared to placebo. No study has isolated Uji Matcha specifically, so these effects are attributed to its L-theanine and caffeine content rather than any unique regional property.

### Is Uji Matcha safe to drink every day?

Daily consumption of 1–3g of Uji Matcha powder (approximately 1–3 prepared servings) is considered safe for most healthy adults, providing a moderate caffeine intake of 30–90mg and antioxidant polyphenols within tolerable ranges. Individuals sensitive to caffeine may experience insomnia, tachycardia, or anxiety at higher intakes. Those with iron-deficiency anemia should avoid drinking matcha with iron-rich meals, as catechins can reduce non-heme iron absorption by up to 25% according to in vitro studies.

### How does Uji Matcha compare to green tea supplements for antioxidant benefits?

Uji Matcha consumed as a beverage delivers EGCG through a whole-food matrix alongside fiber, chlorophyll, and cofactor polyphenols, whereas standardized green tea extract supplements typically isolate catechins at doses of 200–800mg EGCG per capsule. The bioavailability of EGCG from matcha beverage is comparable to brewed green tea but considerably lower per gram than concentrated supplements. High-dose green tea extract supplements carry a documented hepatotoxicity risk absent from normal matcha beverage consumption, making the beverage form a safer option for daily antioxidant intake.

### What is the shade-growing process used for Uji Matcha, and how does it affect the final product?

Uji Matcha is grown under shade cloth for several weeks before harvest, which blocks direct sunlight and increases chlorophyll and L-theanine production in the leaves. This shade-growing technique results in a vibrant green color, smoother flavor profile, and higher amino acid content compared to sun-exposed green teas. The process is traditional to the Uji region of Japan and is considered essential to authentic Uji Matcha quality.

### Can Uji Matcha interact with medications, particularly blood thinners or stimulants?

Uji Matcha contains caffeine and polyphenols that may interact with blood-thinning medications like warfarin or with stimulant medications, potentially altering their effectiveness. If you take prescription medications, especially anticoagulants or cardiovascular drugs, consult your healthcare provider before regular Uji Matcha consumption. The polyphenol content may also affect iron absorption, which is relevant for individuals taking iron supplements.

### Is Uji Matcha safe for pregnant women, children, or elderly individuals?

Pregnant and nursing women should limit Uji Matcha consumption due to its caffeine content (approximately 25-70 mg per serving), which crosses the placenta; medical guidance recommends consulting a healthcare provider first. Young children may be sensitive to the caffeine and L-theanine combination, while elderly individuals generally tolerate it well unless they have caffeine sensitivity or take interacting medications. For all populations, starting with small amounts and monitoring individual tolerance is advisable.

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