Vinitrox (Grape and Apple Polyphenols)

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.

Origin & History

Vinitrox is a branded polyphenol extract combining specific polyphenol profiles from grapes and apples, developed by Nexira (France). The extract is produced through advanced extraction techniques including microwave-assisted extraction (MAE) and high-pressure, high-temperature extraction (HPTE), isolating polyphenols from grape and apple skins. Vinitrox is standardized to contain more than 60% total polyphenols (measured by Folin method as gallic acid equivalent) with an ORAC value of 12,000 μM trolox equivalent per gram.

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.

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: Both grape and apple polyphenols demonstrate vascular benefits (evidence quality: moderate, mechanism-based evidence)
• Antioxidant protection: 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)

How It Works

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 against exercise-induced oxidative stress.

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, with apple polyphenols showing comparable vascular benefits. Note: Specific PMIDs and detailed sample sizes were not available in the provided research results.

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; 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-mediated effects. No significant vitamins, minerals, fiber, or protein content at functional doses.

Preparation & Dosage

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.

Synergy & Pairings

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

Safety & 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.