# Kyoho Grapes (Vitis vinifera)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/kyoho-grapes
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-27
**Evidence Score:** 4 / 10
**Category:** Traditional Chinese Medicine
**Also Known As:** Giant Mountain Grape, King of Grapes, Japanese Purple Grape, Kyōhō Budō, 巨峰葡萄, Large Peak Grape, Vitis vinifera cv. Kyoho, Black Pearl Grape

## Overview

Kyoho grapes contain high concentrations of anthocyanins, particularly malvidin-3-O-glucoside, which provide antioxidant activity. These compounds may help combat oxidative stress through [free radical scaveng](/ingredients/condition/antioxidant)ing and anti-[inflammatory pathway](/ingredients/condition/inflammation)s.

## Health Benefits

• Antioxidant potential from anthocyanins like malvidin-3-O-glucoside (0.01233 mg/g) - evidence quality: theoretical based on compositional analysis only
• May support [oxidative stress](/ingredients/condition/antioxidant) response via flavan-3-ols and procyanidins - evidence quality: inferred from general grape polyphenol mechanisms, no Kyoho-specific studies
• Contains quercetin (0.08753 mg/g) with potential [anti-inflammatory](/ingredients/condition/inflammation) properties - evidence quality: compound presence confirmed, effects unstudied in Kyoho
• Rich in organic acids including tartaric acid that may support [digestive health](/ingredients/condition/gut-health) - evidence quality: compositional data only, no clinical validation
• Provides vitamin C (ascorbic acid at 0.033 mg/L) - evidence quality: analytically confirmed, health effects not studied

## Mechanism of Action

Kyoho grapes' primary bioactive compounds include anthocyanins like malvidin-3-O-glucoside and flavan-3-ols that neutralize [reactive oxygen species](/ingredients/condition/antioxidant) through electron donation. These polyphenols may modulate antioxidant enzyme systems including superoxide dismutase and catalase. The procyanidins present may also influence [inflammatory pathway](/ingredients/condition/inflammation)s by inhibiting NF-κB activation.

## Clinical Summary

Current evidence for Kyoho grapes is limited to compositional analysis showing malvidin-3-O-glucoside content at 0.01233 mg/g fresh weight. No specific human clinical trials have been conducted on Kyoho grape extracts or supplements. The proposed benefits are extrapolated from general grape polyphenol research, which has shown [antioxidant](/ingredients/condition/antioxidant) effects in various studies. More targeted research on Kyoho grape-specific compounds is needed to establish clinical efficacy.

## Nutritional Profile

Kyoho grapes (Vitis vinifera × V. labrusca hybrid) are a large-berried, dark-purple table grape cultivar originating in Japan. Per 100 g of fresh edible portion (approximate values): **Macronutrients:** Energy ~67–72 kcal; carbohydrates 16–18 g (primarily glucose and fructose, with smaller amounts of sucrose); dietary fiber 0.8–1.0 g; protein 0.6–0.7 g; fat 0.3–0.4 g. **Vitamins & Minerals:** Vitamin C 3–5 mg; vitamin K ~14 µg; potassium 170–200 mg; calcium 10–15 mg; magnesium 5–7 mg; phosphorus 18–22 mg; iron 0.3–0.5 mg; trace amounts of B-vitamins (thiamin, riboflavin, B6). **Bioactive compounds (skin + seed fractions, per g dry weight unless noted):** Anthocyanins — dominated by malvidin-3-O-glucoside (~0.01233 mg/g fresh weight), with peonidin-3-O-glucoside, cyanidin-3-O-glucoside, delphinidin-3-O-glucoside, and petunidin-3-O-glucoside present in lower concentrations; total anthocyanins in skin ~1.5–4.5 mg/g dry skin weight depending on ripeness and growing conditions. Flavonols — quercetin-3-O-glucoside and free quercetin (~0.08753 mg/g fresh weight); kaempferol and myricetin glycosides in trace amounts. Flavan-3-ols & proanthocyanidins — catechin, epicatechin, epicatechin-3-O-gallate predominantly concentrated in seeds; procyanidins B1 and B2; total proanthocyanidin content in seeds ~40–80 mg/g dry seed weight. Hydroxycinnamic acids — caftaric acid (caffeoyl-tartaric acid), coutaric acid (coumaroyl-tartaric acid), and chlorogenic acid present in pulp and skin at ~0.02–0.10 mg/g fresh weight. Stilbenes — trans-resveratrol detected in skin at ~0.5–2.5 µg/g fresh weight; resveratrol-3-O-glucoside (piceid) also present. Organic acids — tartaric acid (~3–6 mg/g) and malic acid (~1–3 mg/g) in pulp. **Bioavailability notes:** Anthocyanin bioavailability is generally low (estimated <2% absorption in humans), though gut microbial metabolites (e.g., protocatechuic acid, gallic acid) may extend biological activity. Quercetin glycosides have moderately better absorption (~5–10%) than the aglycone form. Proanthocyanidins (especially oligomers >3 units) are poorly absorbed intact but undergo colonic fermentation yielding phenylvalkeric acid and phenylpropionic acid metabolites. Trans-resveratrol undergoes extensive first-pass glucuronidation and sulfation, resulting in low free-form plasma levels; co-consumption with grape matrix components (fiber, fat) may modestly enhance absorption. The high sugar content of Kyoho flesh facilitates rapid energy availability but also contributes to glycemic load (~8–10 per 120 g serving). Seed and skin fractions contain the majority of polyphenolic bioactives; consumption of whole fruit (with skin) substantially increases polyphenol intake versus peeled flesh alone.

## Dosage & Preparation

No clinically studied dosage ranges for Kyoho grapes or their extracts have been established due to absence of human trials. Compositional data shows typical polyphenol levels but no therapeutic dosing guidelines exist. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Kyoho grapes are generally recognized as safe when consumed as food, with no known serious adverse effects reported. Individuals with grape allergies should avoid Kyoho grape products due to potential cross-reactivity. High intake of grape polyphenols may theoretically interact with anticoagulant medications due to potential effects on platelet aggregation. Pregnant and breastfeeding women should limit intake to normal dietary amounts due to insufficient safety data on concentrated extracts.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specific to Kyoho grapes were identified in the available research. The evidence is limited to compositional analyses showing polyphenol content and in vitro studies on general Vitis vinifera extracts, with no Kyoho-specific human data or PubMed PMIDs available.

## Historical & Cultural Context

Kyoho grapes lack documented historical use in traditional medicine systems as they are a modern Japanese hybrid from the mid-20th century. Unlike ancient Vitis vinifera varieties used in European folk medicine, Kyoho is primarily cultivated as a premium table grape without traditional medicinal applications.

## Synergistic Combinations

Vitamin C, Grape seed extract, Quercetin, Green tea extract, Resveratrol

## Frequently Asked Questions

### How much malvidin-3-O-glucoside is in Kyoho grapes?

Kyoho grapes contain approximately 0.01233 mg of malvidin-3-O-glucoside per gram of fresh fruit weight. This anthocyanin compound is responsible for the grape's dark purple color and antioxidant properties.

### What makes Kyoho grapes different from regular grapes?

Kyoho grapes are a Japanese variety with larger berries and thicker skin containing higher concentrations of anthocyanins. They have a unique polyphenol profile compared to common grape varieties, with particularly high levels of malvidin-based compounds.

### Can Kyoho grape supplements help with oxidative stress?

While Kyoho grapes contain antioxidant compounds like anthocyanins and procyanidins, specific clinical evidence is lacking. The theoretical benefits are based on compositional analysis and general grape polyphenol research rather than direct human studies.

### Are there any side effects of eating Kyoho grapes?

Kyoho grapes are generally safe for most people when consumed in normal dietary amounts. Potential side effects are limited to grape allergies or digestive upset from excessive consumption due to natural sugars and fiber content.

### How do Kyoho grapes compare to other antioxidant fruits?

Kyoho grapes have a unique anthocyanin profile but their antioxidant capacity hasn't been directly compared to other fruits in clinical studies. The malvidin-3-O-glucoside content is notable, but more research is needed to establish relative antioxidant potency compared to blueberries or other anthocyanin-rich fruits.

### What is the bioavailability of anthocyanins from Kyoho grape supplements compared to fresh grapes?

Anthocyanins from Kyoho grapes have relatively low bioavailability, with most being metabolized by gut microbiota rather than absorbed intact into the bloodstream. Processing methods and extraction techniques can affect anthocyanin stability and absorption rates, though standardized Kyoho grape extracts may offer more consistent delivery than fresh fruit. Individual factors such as gut microbiome composition and digestive health significantly influence how much anthocyanin content actually reaches systemic circulation.

### Does Kyoho grape supplementation interact with blood-thinning medications like warfarin?

While Kyoho grapes contain polyphenols with potential anticoagulant properties, direct clinical interactions with warfarin or other blood thinners have not been specifically studied. However, individuals taking anticoagulant medications should consult their healthcare provider before adding Kyoho grape supplements, as polyphenol-rich supplements may theoretically potentiate bleeding risk. Whole food consumption of grapes is generally considered safe for those on blood thinners when intake remains consistent.

### Who would benefit most from Kyoho grape supplementation—athletes, aging populations, or others?

Kyoho grapes may theoretically benefit individuals exposed to chronic oxidative stress, including aging populations and endurance athletes, due to their anthocyanin and quercetin content. However, current evidence is limited to compositional analysis and theoretical mechanisms rather than clinical trials demonstrating specific benefits in these groups. Those seeking cardiovascular or antioxidant support may consider Kyoho grapes, but results likely vary based on individual oxidative stress levels and overall dietary antioxidant intake.

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