Flavoxine (Aqueous Extract of Grape Seed)

Flavoxine is an aqueous extract of grape seed standardized for procyanidins and flavonoids, which act as potent antioxidants primarily by scavenging superoxide radicals and inhibiting key enzymes linked to oxidative stress and blood sugar regulation. Its α-glucosidase inhibitory activity, with a measured IC50 of approximately 2.53 µg/mL, suggests meaningful antidiabetic potential that distinguishes it from conventional grape seed oil extracts.

Origin & History

Flavoxine is a branded aqueous extract derived from grape seeds (Vitis vinifera), a byproduct of winemaking, obtained through water-based extraction methods such as maceration or lyophilization to preserve phenolic compounds. The extract is standardized by total phenolic content, total flavonoids, and procyanidins, with procyanidin levels reaching up to 139.14 mg CE/g dry weight.

Historical & Cultural Context

No historical or traditional medicine context was documented in the research for Flavoxine or grape seed extracts. The research dossier provides no information on traditional uses or cultural significance.

Health Benefits

• Antioxidant properties through superoxide radical scavenging (evidence from in vitro studies only)
• Anti-inflammatory effects attributed to high procyanidin and flavonoid content (preliminary evidence from laboratory studies)
• Antidiabetic potential via α-glucosidase inhibition with IC50 ~2.53 µg/mL (in vitro data only)
• Anticancer properties suggested from cell culture models (no human clinical evidence)
• Anti-obesity effects shown in enzyme inhibition assays (preliminary laboratory evidence only)

How It Works

Flavoxine exerts antioxidant activity primarily through direct superoxide radical scavenging by its procyanidin oligomers and flavonoids such as catechin and epicatechin, which donate hydrogen atoms to neutralize reactive oxygen species before they damage cellular membranes or DNA. It inhibits α-glucosidase, the intestinal enzyme responsible for converting dietary carbohydrates into absorbable glucose, thereby slowing postprandial glucose uptake in a mechanism comparable to the drug acarbose. Its anti-inflammatory effects are attributed to downregulation of pro-inflammatory mediator pathways, likely involving NF-κB signaling suppression secondary to reduced oxidative stress load.

Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses were found for Flavoxine or grape seed aqueous extracts in the research dossier. All available evidence comes from in vitro and animal models, with no PubMed PMIDs provided for human studies.

Clinical Summary

Current evidence for Flavoxine specifically is limited to in vitro and laboratory-based studies; no published randomized controlled trials in human subjects have evaluated this particular aqueous extract formulation directly. In vitro antioxidant assays demonstrate superoxide scavenging activity, and enzyme inhibition studies document an α-glucosidase IC50 of approximately 2.53 µg/mL, which is a competitive benchmark against standard antidiabetic reference compounds. Broader human clinical research on grape seed procyanidin extracts generally supports antioxidant and modest cardiovascular benefits at doses of 150–300 mg daily, though these findings cannot be directly extrapolated to Flavoxine without formulation-specific trials. The overall evidence base must be characterized as preliminary, and clinical efficacy claims require validation through adequately powered human studies.

Nutritional Profile

Flavoxine is a concentrated aqueous extract of grape seed (Vitis vinifera), not a whole food ingredient, so traditional macronutrient framing is largely inapplicable. Its nutritional and bioactive profile is dominated by polyphenolic compounds: Proanthocyanidins (oligomeric procyanidins, OPCs) are the primary bioactive class, typically comprising 60–80% of a standardized grape seed extract by dry weight, with dimers, trimers, and higher-order oligomers of catechin and epicatechin units. Monomeric flavan-3-ols include catechin and epicatechin, commonly present at 5–15% of extract weight in standard preparations. Flavonoids including quercetin glycosides and kaempferol derivatives are present in smaller quantities (estimated 1–5%). Phenolic acids such as gallic acid and its esters (e.g., epicatechin gallate) contribute to the total polyphenol pool. Total polyphenol content in standardized grape seed extracts typically ranges from 95–99% polyphenols by specification (per certificate of analysis standards), though aqueous extraction yields may be lower than solvent-based extracts, typically 40–75% total polyphenols by dry weight. Mineral content is negligible in a concentrated extract form. Protein and fiber content are minimal (<2% combined in purified extract). Vitamins are not a meaningful component. Bioavailability note: Monomeric catechins exhibit moderate oral bioavailability (~20–30%), while larger OPC oligomers have significantly lower and more variable absorption; gut microbiota metabolism to smaller phenolic acids (e.g., 3-hydroxyphenylpropionic acid, 4-hydroxyphenylacetic acid) likely contributes to systemic effects. The aqueous extraction method favors water-soluble lower-molecular-weight procyanidins over larger, less-soluble oligomers, which may enhance relative bioavailability compared to whole grape seed powder. Specific concentration data for Flavoxine as a proprietary extract are not publicly disclosed beyond the IC50 antidiabetic assay value of ~2.53 µg/mL (α-glucosidase inhibition, in vitro).

Preparation & Dosage

No clinically studied dosage ranges are available for Flavoxine. Studies only mention standardization methods using total phenolic content, total flavonoids, and procyanidins measured via spectrophotometric methods. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Vitamin C, Vitamin E, Alpha-lipoic acid, Green tea extract, Resveratrol

Safety & Interactions

Grape seed extracts are generally well tolerated in adults at commonly studied doses up to 300 mg per day, with reported adverse effects limited to mild gastrointestinal discomfort, headache, and dizziness in isolated cases. Flavoxine's procyanidin content may potentiate the effects of anticoagulant and antiplatelet medications such as warfarin and aspirin due to mild platelet aggregation inhibition, making concurrent use a clinical consideration requiring monitoring. Because aqueous extraction retains highly polar polyphenolic compounds, individuals with known grape or wine allergies should exercise caution. Safety data specific to pregnancy, lactation, and pediatric populations are absent for this formulation, and use in these groups cannot be recommended without further study.