# Isorhamnetin glucoside **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/isorhamnetin-glucoside **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-19 **Evidence Score:** 4 / 10 **Category:** Compound **Also Known As:** Isorhamnetin 7-O-glucoside, Isorhamnetin 3-O-glucoside, Isorhamnetin-7-glucoside, 3'-Methoxyquercetin glucoside, Quercetin 3'-methyl ether glucoside, Isorhamnetin glycoside ## Overview Isorhamnetin glucoside is a methylated flavonol glycoside that provides antioxidant activity through [free radical scaveng](/ingredients/condition/antioxidant)ing mechanisms. This compound undergoes intestinal [metabolism](/ingredients/condition/weight-management) to produce bioactive metabolites including kaempferol and quercetin. ## Health Benefits • [Antioxidant](/ingredients/condition/antioxidant) properties noted in research, though only in vitro evidence available • Potential [gut microbiome](/ingredients/condition/gut-health) modulation through bacterial fermentation (preliminary evidence from in vitro studies) • May yield beneficial metabolites like kaempferol and quercetin after intestinal [metabolism](/ingredients/condition/weight-management) (in vitro data only) • Possible role in flavonoid biosynthesis pathways (mechanistic studies only) • No human clinical trials available to confirm any health benefits ## Mechanism of Action Isorhamnetin glucoside exerts antioxidant effects by donating electrons to neutralize [reactive oxygen species](/ingredients/condition/antioxidant) and chelating metal ions that catalyze oxidative reactions. Upon ingestion, intestinal β-glucosidases cleave the glucose moiety, releasing isorhamnetin which can be further demethylated to produce kaempferol and quercetin. These metabolites interact with cellular antioxidant pathways including Nrf2 activation and modulation of gut microbiota composition through selective bacterial fermentation. ## Clinical Summary Current research on isorhamnetin glucoside is limited to in vitro laboratory studies examining its antioxidant capacity and metabolic fate. Cell culture studies have demonstrated [free radical scaveng](/ingredients/condition/antioxidant)ing activity, though specific IC50 values and direct cellular protective effects require further investigation. Preliminary in vitro fermentation studies suggest potential [prebiotic](/ingredients/condition/gut-health) effects through selective bacterial [metabolism](/ingredients/condition/weight-management), but no human clinical trials have been conducted. The evidence base remains insufficient to establish definitive therapeutic benefits or optimal dosing protocols. ## Nutritional Profile Isorhamnetin glucoside (isorhamnetin-3-O-glucoside, molecular weight ~478.4 g/mol) is a methylated flavonol glycoside — the 3'-O-methyl derivative of quercetin bound to glucose at the 3-position. It is not a macronutrient source and contains no significant vitamins, minerals, fiber, or protein. Found in foods such as sea buckthorn berries (50–200 mg/kg dry weight), onion skins, ginkgo leaves, and certain Brassica vegetables at low concentrations (typically 1–30 mg per serving depending on source). As a glycoside, it has limited direct intestinal absorption; bioavailability is low (~2–5% intact absorption estimated from flavonol glycoside studies). The glucose moiety is cleaved by intestinal β-glucosidases and lactase-phlorizin hydrolase, releasing free isorhamnetin aglycone. A substantial fraction (~70–80%) passes to the colon where gut microbiota further degrade it into smaller phenolic acids (3,4-dimethoxyphenylacetic acid, 3-hydroxyphenylacetic acid) and potentially regenerate quercetin/kaempferol via demethylation. Hepatic phase II [metabolism](/ingredients/condition/weight-management) produces glucuronide and sulfate conjugates, which are the predominant circulating forms with plasma half-life estimated at 2–5 hours. ## Dosage & Preparation No clinically studied dosage ranges are available as no human trials have been conducted. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions No specific safety data exists for isorhamnetin glucoside as an isolated compound, though it is generally consumed as part of flavonoid-rich foods without reported adverse effects. Theoretical interactions may occur with medications metabolized by cytochrome P450 enzymes, similar to other flavonoids, though clinical significance remains unknown. Pregnant and breastfeeding women should avoid supplemental forms due to lack of safety data. Individuals with known flavonoid sensitivities should exercise caution when consuming concentrated sources. ## Scientific Research No human clinical trials, RCTs, or meta-analyses specifically on isorhamnetin glucoside have been conducted. Current research is limited to in vitro [metabolism](/ingredients/condition/weight-management) studies examining bacterial fermentation by intestinal microbiota, without any published PMIDs or clinical outcome data. ## Historical & Cultural Context No historical or traditional medicine uses are documented for isorhamnetin glucoside. The compound has only been studied in modern laboratory settings. ## Synergistic Combinations Pairs well with **quercetin** (500 mg), **vitamin C** (250–500 mg), **piperine** (5–10 mg from black pepper extract), and **rutin** (250 mg). Quercetin and isorhamnetin share overlapping yet complementary antioxidant mechanisms — quercetin's catechol B-ring and isorhamnetin's methylated B-ring target different [reactive oxygen species](/ingredients/condition/antioxidant) and may additively inhibit [NF-κB](/ingredients/condition/inflammation) and xanthine oxidase pathways. Vitamin C regenerates oxidized flavonol radicals back to their active reduced forms, extending their antioxidant cycling capacity, while also stabilizing these flavonoids in the gut lumen. Piperine inhibits hepatic UDP-glucuronosyltransferase and CYP3A4 enzymes, significantly slowing phase II conjugation and first-pass [metabolism](/ingredients/condition/weight-management) of isorhamnetin aglycone, thereby increasing its plasma bioavailability by an estimated 30–50%. Rutin (quercetin-3-O-rutinoside) provides a slower-release colonic source of quercetin via microbial rhamnosidase activity, creating a sustained complementary flavonol presence alongside isorhamnetin glucoside's earlier small-intestinal release. ## Frequently Asked Questions ### What foods contain isorhamnetin glucoside naturally? Isorhamnetin glucoside is found in various plant foods including onions, apples, grapes, and certain medicinal herbs like Ginkgo biloba. The concentration varies significantly between plant species and growing conditions. ### How is isorhamnetin glucoside different from quercetin? Isorhamnetin glucoside is a methylated and glycosylated derivative of quercetin, making it more stable but requiring intestinal metabolism to release active compounds. Quercetin is the direct aglycone form with immediate bioactivity. ### Does isorhamnetin glucoside have better absorption than other flavonoids? The glucose attachment may initially improve water solubility, but the compound requires intestinal β-glucosidase activity for absorption of the active aglycone. Absorption efficiency compared to other flavonoids has not been directly studied in humans. ### Can isorhamnetin glucoside supplements cause side effects? No specific side effects have been documented for isorhamnetin glucoside supplements, as clinical safety studies are lacking. Theoretical concerns include potential digestive upset at high doses and interactions with blood-thinning medications. ### What is the recommended dosage for isorhamnetin glucoside? No established dosage recommendations exist for isorhamnetin glucoside due to insufficient clinical research. Most exposure occurs through dietary sources, with supplemental dosing requiring further safety and efficacy studies. ### What happens to isorhamnetin glucoside when it passes through the digestive system? Isorhamnetin glucoside undergoes intestinal metabolism where it may be converted into other beneficial compounds, including kaempferol and quercetin, through enzymatic breakdown. This metabolic transformation is supported by preliminary in vitro evidence, though human studies confirming these metabolic pathways are currently lacking. The role of gut bacteria in fermenting isorhamnetin glucoside to produce active metabolites shows promise but requires further clinical investigation. ### Is there clinical evidence supporting isorhamnetin glucoside supplementation in humans? Currently, the evidence for isorhamnetin glucoside is primarily limited to in vitro (laboratory) and mechanistic studies, with no substantial human clinical trials published to date. While research demonstrates antioxidant properties and potential gut microbiome modulation in controlled laboratory conditions, these findings have not yet been confirmed in human populations. Anyone considering this supplement should be aware that health claims are not yet supported by human clinical evidence. ### How does isorhamnetin glucoside interact with the gut microbiome? Preliminary in vitro evidence suggests that isorhamnetin glucoside may be fermented by intestinal bacteria, potentially modulating the composition or activity of the gut microbiome. This bacterial fermentation could contribute to the generation of secondary metabolites with bioactive properties, though the clinical significance remains unknown. Human studies are needed to determine whether these laboratory observations translate to meaningful changes in gut health or overall wellness. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*