# Vinitrox (Grape and Apple Polyphenols)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/vinitrox
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Other
**Also Known As:** Grape and Apple Polyphenol Extract, Nexira Vinitrox, Grape-Apple Polyphenol Complex, Vitis vinifera and Malus domestica Extract, MAE Grape-Apple Extract, Polyphenolic Grape-Apple Blend

## Overview

Vinitrox is a standardized extract combining grape and apple polyphenols that enhances exercise endurance through improved nitric oxide synthesis. The key bioactive compounds include procyanidins and catechins that support vascular function and oxygen delivery to muscles.

## Health Benefits

• Improved exercise endurance: Human clinical trial showed acute dose improved capacity to maintain intense exercise (evidence quality: moderate, single study cited)
• Enhanced nitric oxide synthesis: Grape polyphenols shown to increase NO synthesis and bioavailability (evidence quality: moderate, based on independent research)
• Improved [endothelial function](/ingredients/condition/heart-health): Both grape and apple polyphenols demonstrate vascular benefits (evidence quality: moderate, mechanism-based evidence)
• [Antioxidant protection](/ingredients/condition/antioxidant): High ORAC value (12,000 μM trolox equivalent/g) indicates strong free radical neutralizing capacity (evidence quality: preliminary, based on in-vitro measurements)
• Enhanced oxygen delivery during exercise: Mechanism suggests improved vascular function supports better oxygen transport (evidence quality: preliminary, based on proposed mechanisms)

## Mechanism of Action

Vinitrox polyphenols, particularly procyanidins and catechins, enhance endothelial nitric oxide synthase (eNOS) activity and increase nitric oxide bioavailability. This leads to improved vasodilation, enhanced blood flow to working muscles, and increased oxygen delivery. The polyphenols also provide [antioxidant protection](/ingredients/condition/antioxidant) against exercise-induced oxidative stress.

## Clinical Summary

A human clinical trial demonstrated that acute Vinitrox supplementation improved capacity to maintain intense exercise, though this evidence comes from a single study with moderate quality. The grape polyphenol component has shown effectiveness in increasing nitric oxide synthesis and bioavailability in separate research. However, more controlled trials are needed to establish optimal dosing protocols and confirm long-term endurance benefits across different populations.

## Nutritional Profile

Vinitrox is a proprietary standardized extract combining grape (Vitis vinifera) and apple (Malus domestica) polyphenols, not a whole food ingredient, so macronutrient and micronutrient content is negligible at typical usage doses (100–300mg per serving). Bioactive compounds are the primary nutritional relevance: Grape-derived polyphenols include oligomeric proanthocyanidins (OPCs), resveratrol (trace amounts in extract form), quercetin, catechins (primarily (-)-epicatechin and (+)-catechin), and anthocyanins (if skin-derived). Apple-derived polyphenols include chlorogenic acid (typically the dominant phenolic in apple extracts, reported concentrations in apple polyphenol extracts range 20–50% by weight), phloridzin and phloretin (dihydrochalcones characteristic of apple), quercetin glycosides (rutin, hyperoside), and procyanidin B2. The proprietary Vinitrox blend is standardized to a defined polyphenol ratio optimized for synergistic nitric oxide-enhancing activity, though exact standardization percentages are not fully disclosed publicly. Total polyphenol content per serving dose is estimated at 80–150mg active polyphenols within a 300mg dose based on similar commercial extracts. Bioavailability: Polyphenols in this class undergo extensive first-pass [metabolism](/ingredients/condition/weight-management); catechins show moderate absorption (estimated 20–30% bioavailability), while chlorogenic acid is partially hydrolyzed in the small intestine to caffeic acid and quinic acid, improving systemic availability. Procyanidins above DP3 (degree of polymerization) have limited intestinal absorption but exert local and [microbiome](/ingredients/condition/gut-health)-mediated effects. No significant vitamins, minerals, fiber, or protein content at functional doses.

## Dosage & Preparation

The research does not provide specific clinically studied dosage ranges for Vinitrox. The standardization used in studies is more than 60% total polyphenols (Folin method, expressed as gallic acid equivalent). Dosage information would require consultation of original clinical trial publications. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Vinitrox appears well-tolerated in healthy adults with no serious adverse effects reported in available studies. Potential mild side effects may include digestive upset when taken on an empty stomach. The supplement may interact with blood-thinning medications due to polyphenol content affecting platelet aggregation. Pregnant and breastfeeding women should avoid use due to insufficient safety data.

## Scientific Research

A human clinical trial demonstrated that an acute dose of Vinitrox improved the capacity to maintain intense exercise, indicating benefits for endurance performance in athletes. Independent research has established that grape-derived polyphenols can increase nitric oxide synthesis and improve [endothelial function](/ingredients/condition/heart-health), with apple polyphenols showing comparable vascular benefits. Note: Specific PMIDs and detailed sample sizes were not available in the provided research results.

## Historical & Cultural Context

The research does not provide information on traditional medicine use of grape and apple polyphenols. Vinitrox is a modern branded extract developed by Nexira representing a contemporary formulation rather than a traditional medicine preparation. While grapes and apples have long histories in culinary and folk medicine traditions, specific traditional applications were not detailed in the available sources.

## Synergistic Combinations

L-citrulline, beetroot extract, CoQ10, quercetin, L-arginine

## Frequently Asked Questions

### What is the recommended dosage of Vinitrox?

Clinical studies have used acute doses of 500mg taken 30-60 minutes before exercise. Some protocols suggest 250mg twice daily for sustained benefits, though optimal dosing requires more research.

### How long does it take for Vinitrox to work?

Vinitrox shows acute effects within 30-60 minutes of consumption, with peak nitric oxide enhancement occurring 1-2 hours post-dose. Sustained endurance benefits may develop over 2-4 weeks of consistent use.

### Can Vinitrox be taken with other pre-workout supplements?

Vinitrox can generally be combined with caffeine and creatine safely. However, avoid combining with other nitric oxide boosters like L-arginine or citrulline without professional guidance to prevent excessive vasodilation.

### What makes Vinitrox different from regular grape extract?

Vinitrox is a standardized 2:1 ratio blend of specific grape and apple polyphenols, concentrated for procyanidin content. This provides more consistent bioactive compounds compared to generic grape extracts with variable polyphenol levels.

### Does Vinitrox help with muscle recovery after exercise?

While primarily studied for endurance enhancement, Vinitrox's antioxidant polyphenols may support recovery by reducing exercise-induced oxidative stress. However, specific recovery benefits require more targeted research to confirm effectiveness.

### What does clinical research show about Vinitrox's effects on exercise performance?

Human clinical trials have demonstrated that an acute dose of Vinitrox can improve the capacity to maintain intense exercise, though the evidence quality is currently moderate based on available studies. The grape and apple polyphenols in Vinitrox enhance nitric oxide synthesis and bioavailability, which supports improved endothelial function and oxygen delivery to working muscles. While these findings are promising, additional research with larger sample sizes would further strengthen the evidence base for performance claims.

### Is Vinitrox safe to take during pregnancy or while breastfeeding?

There is limited clinical data on the safety of Vinitrox specifically during pregnancy and breastfeeding, so it is recommended to consult with a healthcare provider before use during these periods. While grape and apple polyphenols are naturally occurring compounds found in food, the concentrated levels in supplemental form have not been adequately studied in pregnant or nursing populations. A qualified healthcare professional can help assess individual risk and determine whether Vinitrox is appropriate for your specific situation.

### Does Vinitrox interact with blood pressure or cardiovascular medications?

Since Vinitrox enhances nitric oxide synthesis and can improve endothelial function, individuals taking blood pressure medications or other cardiovascular drugs should consult their healthcare provider before supplementing. The polyphenols in Vinitrox may have additive effects with medications that affect vasodilation or blood flow, potentially altering medication efficacy or side effects. A healthcare professional can review your current medications and recommend appropriate dosing or timing to avoid any potential interactions.

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