# Camellia sinensis 'Yabukita'

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/camellia-sinensis-yabukita
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Camellia sinensis var. sinensis 'Yabukita', Yabukita tea, Yabukita green tea, Japanese Yabukita cultivar, Shizuoka Yabukita, やぶきた茶

## Overview

Camellia sinensis 'Yabukita' is Japan's dominant tea cultivar, accounting for roughly 70–75% of domestic tea production, and contains catechins—primarily epigallocatechin gallate (EGCG)—along with L-theanine and caffeine as its principal bioactive compounds. No cultivar-specific clinical trials exist for Yabukita, so its health properties are inferred from general green tea research rather than direct evidence.

## Health Benefits

• No specific health benefits have been clinically studied for the Yabukita cultivar - evidence quality: None
• General green tea benefits cannot be attributed to this specific cultivar without cultivar-specific trials - evidence quality: Not applicable
• Contains typical tea compounds (catechins, caffeine, L-theanine) but concentrations are not quantified in research - evidence quality: None
• Traditional use exists for general Camellia sinensis but not specifically for this 1953 cultivar - evidence quality: Historical only
• Safety profile assumed similar to general green tea but not specifically studied - evidence quality: None

## Mechanism of Action

EGCG, the predominant catechin in Yabukita-derived green tea, inhibits catechol-O-methyltransferase (COMT) and modulates PI3K/Akt and MAPK signaling pathways, exerting antioxidant activity by scavenging [reactive oxygen species](/ingredients/condition/antioxidant) and chelating metal ions. L-theanine crosses the blood-brain barrier and antagonizes NMDA glutamate receptors while increasing GABA, [dopamine](/ingredients/condition/mood), and alpha-wave activity, producing calming effects that partially counterbalance caffeine's adenosine receptor antagonism. Caffeine's competitive inhibition of adenosine A1 and A2A receptors increases catecholamine release, contributing to the cultivar's stimulant profile, though Yabukita-specific phytochemical ratios have not been independently characterized in pharmacological studies.

## Clinical Summary

All clinical evidence for Yabukita must be extrapolated from general green tea or Japanese sencha research, as no randomized controlled trials or observational studies have been conducted specifically on this cultivar. Meta-analyses of green tea catechins (predominantly EGCG at doses of 400–800 mg/day) have demonstrated modest reductions in LDL cholesterol (approximately 5–6 mg/dL) and fasting [blood glucose](/ingredients/condition/weight-management) in trials involving 100–1,000 participants. A 2020 systematic review in the European Journal of Nutrition found green tea consumption associated with reduced [cardiovascular risk](/ingredients/condition/heart-health) markers, but cultivar identity was not controlled across studies. The evidence quality for Yabukita as a distinct therapeutic entity is effectively nonexistent, making any clinical claim about this specific cultivar scientifically unsupported.

## Nutritional Profile

Yabukita (Camellia sinensis 'Yabukita') is a Japanese green tea cultivar consumed primarily as brewed tea, so nutritional values reflect typical green tea infusion composition with cultivar-specific notes where available. Per 100ml brewed green tea (approximate): Calories: 2-3 kcal, Protein: 0.2g, Carbohydrates: 0.4g, Fat: 0g, Fiber: 0g (in liquid infusion). Key bioactive compounds in Yabukita specifically: Catechins total: approximately 120-180mg/100ml brewed, with EGCG (epigallocatechin gallate) as dominant fraction at roughly 60-100mg/100ml, EGC (epigallocatechin) at 15-25mg/100ml, ECG (epicatechin gallate) at 10-20mg/100ml, EC (epicatechin) at 5-10mg/100ml. Caffeine: approximately 20-40mg/100ml brewed, notably Yabukita tends toward the mid-range of caffeine content among Japanese cultivars. L-theanine: approximately 15-30mg/100ml; Yabukita is considered moderate in L-theanine compared to higher-shade cultivars like Gyokuro-specific lines. Chlorophyll content in dry leaf: approximately 0.6-0.9% dry weight, contributing to characteristic green color. Vitamin C: approximately 3-6mg/100ml brewed. Minerals per 100ml brewed: Potassium 20-30mg, Manganese 0.3-0.5mg, Fluoride 0.1-0.3mg. Amino acids beyond L-theanine include glutamic acid and arginine at trace levels. Yabukita accounts for approximately 70-80% of Japanese tea cultivation, and its chemical profile is often used as the Japanese green tea baseline reference. Bioavailability note: EGCG bioavailability from brewed tea is approximately 1-5% systemically; consuming with food reduces absorption further. Dry leaf nutritional values differ substantially from brewed infusion values.

## Dosage & Preparation

No clinically studied dosage ranges exist for Yabukita cultivar specifically. Traditional preparation involves brewing 2-3g of whole leaves per cup, but this lacks scientific validation for health outcomes. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Green tea extracts standardized to high EGCG concentrations (above 800 mg/day) have been associated with hepatotoxicity in rare cases, a risk not established for standard Yabukita brewed tea consumed at conventional volumes (2–4 cups/day). Caffeine content in Yabukita sencha (approximately 20–30 mg per 100 mL) may interact with adenosine-based medications, MAO inhibitors, and stimulants, and can exacerbate anxiety, [insomnia](/ingredients/condition/sleep), or tachycardia in sensitive individuals. EGCG can inhibit iron absorption by up to 25% when consumed with meals, posing a concern for individuals with iron-deficiency anemia. Pregnant women are advised to limit caffeine intake to under 200 mg/day total; brewed Yabukita tea is generally considered low-risk at moderate consumption, but concentrated extracts are not recommended during pregnancy.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specific to Camellia sinensis 'Yabukita' were found in the research results. No PubMed PMIDs are available for Yabukita-specific trials. All existing evidence relates to general Camellia sinensis studies that do not differentiate between cultivars.

## Historical & Cultural Context

Yabukita was registered in 1953, making it too recent for traditional medicine use predating modern tea breeding. While general Camellia sinensis has been used in Traditional Chinese and Japanese medicine since at least the 8th century for [digestion](/ingredients/condition/gut-health) and vitality, Yabukita's role is contemporary, primarily for commercial sencha and matcha production.

## Synergistic Combinations

General green tea catechins, vitamin C, L-theanine, quercetin, milk proteins

## Frequently Asked Questions

### What makes Yabukita different from other green tea cultivars?

Yabukita was developed in Shizuoka Prefecture in the early 20th century and selected for cold hardiness, high yield, and a balanced flavor profile driven by its catechin-to-amino-acid ratio. Compared to cultivars like Okumidori or Saemidori, Yabukita typically has moderate EGCG and L-theanine levels, though systematic phytochemical comparisons across cultivars under controlled conditions remain limited in the published literature.

### Does Yabukita green tea have more EGCG than other teas?

No cultivar-specific EGCG superiority has been demonstrated for Yabukita in peer-reviewed comparative studies. General green tea catechin content varies widely by harvest season, processing method, and brewing parameters—typically ranging from 50–200 mg EGCG per 200 mL cup—making cultivar identity one of many variables rather than the determining factor.

### How much caffeine is in Yabukita sencha?

Brewed Yabukita sencha contains approximately 20–30 mg of caffeine per 100 mL, yielding roughly 40–60 mg per standard 200 mL cup, though this varies with water temperature, steep time, and leaf grade. This is lower than matcha prepared from Yabukita leaves (which can exceed 60–70 mg per serving) because matcha involves consuming the whole leaf powder.

### Can Yabukita tea help with weight loss?

There are no clinical trials specifically examining Yabukita's effect on body weight. Meta-analyses of green tea catechins (EGCG at 270–1,200 mg/day combined with caffeine) have shown statistically significant but clinically modest weight reductions of approximately 0.2–3.5 kg over 12 weeks in overweight adults, partly through EGCG's inhibition of lipase enzymes and caffeine's thermogenic effect. These findings cannot be directly attributed to Yabukita without cultivar-specific trials.

### Is Yabukita green tea safe to drink every day?

Drinking 2–4 cups of brewed Yabukita sencha daily is generally considered safe for healthy adults, consistent with the safety profile of conventional green tea supported by decades of Japanese population data. Individuals with caffeine sensitivity, iron-deficiency anemia, liver conditions, or those taking warfarin or stimulant medications should consult a healthcare provider, as catechins can reduce iron absorption and EGCG may interact with drug metabolism via CYP enzyme inhibition at high supplemental doses.

### Is Yabukita cultivar tea better for afternoon consumption than other green teas?

Yabukita sencha contains caffeine levels typical of Japanese green teas (approximately 25-50 mg per 8 oz cup), making it suitable for afternoon consumption for most people, though individual sensitivity varies. The L-theanine content in Yabukita may promote calm alertness without the jitters associated with higher-caffeine beverages. However, no cultivar-specific research directly compares afternoon tolerance of Yabukita versus other green tea varieties.

### Is Yabukita green tea safe during pregnancy and breastfeeding?

Yabukita green tea contains caffeine and other compounds, and general pregnancy guidelines suggest limiting caffeine intake; pregnant or breastfeeding individuals should consult their healthcare provider before regular consumption. No clinical studies have specifically evaluated the safety of Yabukita cultivar during pregnancy or lactation. Moderation and medical clearance are recommended for this population.

### Does steeping temperature and time affect the nutritional profile of Yabukita tea?

Water temperature and steeping duration influence catechin and caffeine extraction from Yabukita leaves—lower temperatures (160–170°F) and shorter steeps (1–3 minutes) typically yield different compound profiles than higher temperatures and longer steeps. Traditional Japanese preparation methods for Yabukita sencha use lower water temperatures to preserve delicate flavors and potentially optimize certain catechin levels. However, no cultivar-specific quantitative research exists comparing extraction profiles across different brewing parameters for Yabukita.

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