# Camellia sinensis 'Saemidori'

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/camellia-sinensis-saemidori
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Camellia sinensis var. sinensis 'Saemidori', Saemidori green tea, Saemidori cultivar, Tea plant Saemidori, Green tea Saemidori, Saemidori cha

## Overview

Camellia sinensis 'Saemidori' is a Japanese green tea cultivar selectively bred from Yabukita, characterized by elevated L-theanine and amino acid concentrations that may contribute to its distinctive umami flavor profile. Its catechins, particularly epigallocatechin gallate (EGCG), are presumed to underlie [antioxidant](/ingredients/condition/antioxidant) and metabolic effects consistent with broader green tea research, though cultivar-specific clinical data remain absent.

## Health Benefits

• No clinical evidence available - cultivar-specific human studies have not been conducted
• Likely contains typical green tea catechins and polyphenols, but concentrations unverified
• Higher amino acid content than Yabukita parent cultivar reported, though health impacts unstudied
• General Camellia sinensis benefits may apply, but cannot be confirmed for this specific cultivar
• [Antioxidant](/ingredients/condition/antioxidant) potential expected from tea polyphenols, but no direct evidence exists

## Mechanism of Action

EGCG, the primary catechin in Camellia sinensis cultivars including Saemidori, inhibits catechol-O-methyltransferase (COMT) and modulates the PI3K/Akt/mTOR signaling pathway, contributing to [antioxidant](/ingredients/condition/antioxidant) and potential anti-proliferative effects. L-theanine, likely present at higher concentrations in Saemidori than in the parent Yabukita cultivar, crosses the blood-brain barrier and promotes alpha-wave neural activity by modulating GABA, glutamate NMDA receptors, and [dopamine](/ingredients/condition/mood) release. Caffeine in the leaf synergizes with L-theanine to attenuate adrenergic overstimulation while sustaining adenosine receptor antagonism, producing a calmer alertness response.

## Clinical Summary

No human clinical trials have been conducted specifically on Camellia sinensis 'Saemidori' as a distinct cultivar, making direct evidence-based health claims impossible. Extrapolated data from general green tea research, including meta-analyses of 10–15 RCTs with sample sizes ranging from 60–300 participants, suggest EGCG-rich preparations may modestly reduce [LDL cholesterol](/ingredients/condition/heart-health) by 5–10 mg/dL and support glycemic control. Saemidori's reported higher amino acid content, particularly L-theanine, is agronomically documented in Japanese cultivar breeding literature, but no controlled trials have quantified its differential health impact versus Yabukita or other cultivars. Overall evidence strength for Saemidori-specific benefits is currently negligible, and all presumed effects are inferred from class-level green tea data.

## Nutritional Profile

Saemidori is a shaded green tea cultivar with a nutritional profile shaped by its high chlorophyll content and elevated amino acid levels relative to its Yabukita parent. Catechins (primary polyphenols): total catechin content estimated at 100–150 mg/g dry weight, comprising epigallocatechin gallate (EGCG) approximately 50–80 mg/g, epicatechin gallate (ECG) approximately 15–25 mg/g, epigallocatechin (EGC) approximately 20–35 mg/g, and epicatechin (EC) approximately 5–15 mg/g; shade cultivation tends to reduce catechin concentrations relative to sun-grown teas. Amino acids: total free amino acid content notably elevated, with L-theanine (theanine) estimated at 2.5–4.0 g/100g dry weight, higher than Yabukita's typical 1.5–2.5 g/100g; theanine constitutes approximately 50–60% of total free amino acids; glutamic acid, arginine, and aspartic acid present in smaller fractions. Caffeine: approximately 2.5–3.5 g/100g dry weight, consistent with shaded cultivars which tend toward higher caffeine. Chlorophyll: elevated due to shade cultivation, estimated at 0.6–1.2 mg/g dry weight (chlorophyll a dominant over chlorophyll b); contributes characteristic bright green liquor. Vitamins: vitamin C (ascorbic acid) approximately 150–250 mg/100g dry weight; vitamin K1 (phylloquinone) approximately 500–900 mcg/100g; trace B-vitamins including riboflavin (B2) and niacin present in small amounts. Minerals: potassium approximately 2,000–2,500 mg/100g dry weight; calcium approximately 300–500 mg/100g; magnesium approximately 150–200 mg/100g; manganese approximately 30–60 mg/100g; fluoride approximately 1–3 mg/100g. Fiber: dietary fiber approximately 35–45 g/100g dry weight (largely insoluble cellulose, not bioavailable in typical infusion). Protein: crude protein approximately 20–30 g/100g dry weight, though extraction into brewed tea is minimal. Bioavailability notes: in brewed tea (standard 2g per 200mL at 70–80°C), catechin extraction is approximately 30–50% of dry-weight content; theanine extraction is high at 80–90% due to its water-soluble nature; minerals and vitamins extract variably, with vitamin C being heat-sensitive and declining with higher brewing temperatures; consuming ground leaf (as matcha-style preparation) significantly increases bioavailability of fat-soluble compounds including chlorophyll and vitamin K; EGCG bioavailability is limited systemically due to poor intestinal absorption and first-pass [metabolism](/ingredients/condition/weight-management).

## Dosage & Preparation

No clinically studied dosage ranges are available for 'Saemidori' due to absence of human trials. General green tea recommendations suggest 200-400mg catechins daily in standardized extracts, but no standardization data exists for this cultivar. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Camellia sinensis preparations are generally well tolerated at moderate consumption levels, but high-dose green tea extracts exceeding 800 mg EGCG daily have been associated with hepatotoxicity in case reports and FDA safety advisories. Caffeine content in Saemidori preparations may interact with stimulant medications, anticoagulants such as warfarin (EGCG may inhibit vitamin K-dependent clotting factor synthesis), and MAO inhibitors. Pregnant individuals should limit total caffeine intake to under 200 mg daily per WHO guidelines, and high-dose green tea supplements are not recommended during pregnancy due to folate absorption interference by EGCG. Individuals with iron-deficiency anemia should avoid consuming Saemidori tea with meals, as catechins chelate non-heme iron and reduce absorption by up to 25%.

## Scientific Research

No clinical trials, randomized controlled trials, or meta-analyses specific to Camellia sinensis 'Saemidori' were identified in the available research. While general studies on Camellia sinensis green teas exist examining catechins for metabolic health, no cultivar-specific human studies or PMIDs are available for this particular variant.

## Historical & Cultural Context

'Saemidori' is a modern cultivar registered in 1990 with no documented traditional medicine use. While Camellia sinensis has been used in Chinese traditional medicine for over 2,000 years for [digestion](/ingredients/condition/gut-health) and vitality, this applies to wild varieties rather than recently bred cultivars like 'Saemidori'.

## Synergistic Combinations

Vitamin C, L-theanine, EGCG extracts, quercetin, turmeric

## Frequently Asked Questions

### What makes Saemidori green tea different from Yabukita?

Saemidori is a hybrid cultivar developed in Japan, bred from Yabukita and Asatsuyu parent lines, selected for higher total free amino acid content, particularly elevated L-theanine, which contributes to its pronounced umami and sweetness. Agronomic studies in Japanese cultivar registries report measurably higher amino acid concentrations compared to the Yabukita standard, though the magnitude varies by harvest season and shading practices. These compositional differences have not yet been translated into controlled clinical health outcome comparisons.

### Does Saemidori green tea contain EGCG?

Yes, as a Camellia sinensis cultivar, Saemidori contains epigallocatechin gallate (EGCG), the predominant catechin in green tea, along with epicatechin (EC), epigallocatechin (EGC), and epicatechin gallate (ECG). Exact EGCG concentrations in Saemidori leaves have not been independently standardized in peer-reviewed literature, but typical unshaded green tea cultivars yield 50–150 mg EGCG per gram of dry leaf extract. Shading practices applied to Saemidori before harvest, common for high-grade matcha production, tend to reduce catechin concentrations while increasing L-theanine.

### Can Saemidori green tea help with focus and relaxation?

The L-theanine content in Saemidori, likely higher than standard Yabukita-based teas, may support calm focus by promoting alpha-wave brain activity and modulating glutamate NMDA receptor activity, based on studies using 100–200 mg isolated L-theanine doses. Combined with caffeine present in the leaf, the L-theanine-caffeine synergy has been demonstrated in at least 12 RCTs to improve sustained attention and reaction time without the anxiety associated with caffeine alone. However, these findings derive from standardized L-theanine supplements, not from Saemidori tea specifically.

### Is Saemidori green tea safe to drink daily?

Drinking 2–4 cups of brewed Saemidori green tea daily is considered safe for most healthy adults, consistent with general green tea safety data reviewed by EFSA and the FDA for whole-leaf preparations. At typical brewed concentrations, EGCG intake remains well below the 800 mg threshold associated with liver stress in supplement form. Individuals sensitive to caffeine, those taking blood thinners like warfarin, or those with liver conditions should consult a healthcare provider before regular high-volume consumption.

### Is Saemidori used to make matcha?

Yes, Saemidori is one of several cultivars used in premium matcha production in Japan, particularly in Kyoto's Uji region, where it is valued for its vibrant green color, smooth flavor, and elevated amino acid content. The shading process applied 3–4 weeks before harvest stimulates chlorophyll and L-theanine accumulation while reducing astringent catechins, resulting in a sweeter, less bitter powder compared to Yabukita-based matcha. Its use in matcha is primarily driven by sensory and agricultural qualities rather than clinically verified superior health outcomes.

### How does Saemidori green tea's amino acid profile compare to other green tea cultivars?

Saemidori contains notably higher levels of amino acids, particularly L-theanine, compared to its parent cultivar Yabukita. However, the specific health implications of this elevated amino acid content have not been studied in clinical research. General green tea amino acid benefits may theoretically apply, but cultivar-specific effects remain unverified.

### Is there clinical evidence supporting health claims specific to Saemidori green tea?

No clinical studies have been conducted on Saemidori as a distinct cultivar, so health claims cannot be confirmed for this specific variety. While Saemidori likely contains typical green tea catechins and polyphenols found in Camellia sinensis, their concentrations in this cultivar are unverified. Any benefits should be attributed to general green tea properties rather than Saemidori-specific effects.

### What is the difference between Saemidori and other Japanese green tea cultivars used in supplements?

Saemidori is distinguished by its higher amino acid content relative to cultivars like Yabukita, making it chemically unique among Japanese green tea varieties. Unlike some premium cultivars, Saemidori is not primarily used for matcha production. The practical supplementation differences between Saemidori and other cultivars remain largely unstudied.

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