Hermetica Superfood Encyclopedia
The Short Answer
Isorhamnetin is a flavonol compound found in onions, almonds, and various plants that exhibits antioxidant properties through free radical scavenging mechanisms. This methylated quercetin derivative shows preliminary activity as a xanthine oxidase inhibitor in laboratory studies.
CategoryNamed Bioactive Compounds
GroupCompound
Evidence LevelStrong
Primary Keywordisorhamnetin benefits
Synergy Pairings3
Isorhamnetin — botanical close-up
Health Benefits
Origin & History
Natural habitat
Isorhamnetin is a monomethoxyflavone classified as a flavonol, specifically a 3'-O-methylated derivative of quercetin with the chemical formula C16H12O7. It occurs naturally as a minor pigment in pungent yellow or red onions and is produced endogenously via methylation of quercetin by the enzyme quercetin 3-O-methyltransferase.
“No historical or traditional medicinal uses of isolated isorhamnetin are documented in the available research. The compound has been identified as a minor component in foods like onions.”Traditional Medicine
Scientific Research
No human clinical trials, RCTs, or meta-analyses for isorhamnetin were found in the research dossier. All available evidence comes from basic laboratory research showing antioxidant properties and xanthine oxidase inhibition.
Preparation & Dosage
Traditional preparation
No clinically studied dosage ranges have been established for isorhamnetin. No standardized forms or extracts have been studied in humans. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
Isorhamnetin (3'-methoxy quercetin, C₁₆H₁₂O₇, MW 316.26) is a methylated flavonol and O-methylated derivative of quercetin. It is not a macronutrient source; it is a bioactive polyphenolic compound found in small quantities in sea buckthorn berries (~0.2-1.5 mg/g dry weight), ginkgo biloba leaves, onions, and various medicinal herbs such as Hippophae rhamnoides and Artemisia absinthium. Typical dietary intake from food sources is estimated at low milligram quantities per day. Isorhamnetin occurs naturally as glycosides (primarily isorhamnetin-3-O-glucoside and isorhamnetin-3-O-rutinoside), which are hydrolyzed in the gut to release the aglycone. Bioavailability is relatively low, similar to other flavonols (~1-5% oral bioavailability in animal models), with extensive first-pass metabolism via glucuronidation and sulfation in the liver and intestinal wall. It is also a major metabolite of quercetin via catechol-O-methyltransferase (COMT) methylation in vivo, meaning dietary quercetin partially converts to isorhamnetin. No significant vitamin or mineral content is attributable to isorhamnetin itself.
How It Works
Mechanism of Action
Isorhamnetin functions as an antioxidant by donating hydrogen atoms to neutralize reactive oxygen species and chelating transition metals like iron and copper. The compound inhibits xanthine oxidase enzyme activity, potentially reducing uric acid production and oxidative stress. Its 3'-methoxy group differentiates it from quercetin and may influence its bioavailability and cellular uptake.
Clinical Evidence
No human clinical trials have been conducted specifically on isorhamnetin supplementation or isolated compounds. Available research is limited to in vitro laboratory studies and animal models examining antioxidant capacity and enzyme inhibition. The evidence base consists entirely of preliminary basic research without controlled human data. No therapeutic dosages, efficacy outcomes, or safety profiles have been established in human populations.
Safety & Interactions
Safety data for isorhamnetin supplementation is not available due to lack of human studies. Potential interactions with medications metabolized by cytochrome P450 enzymes are theoretically possible but unconfirmed. As a flavonol compound, it may theoretically interact with anticoagulant medications, though this has not been documented. Pregnant and breastfeeding women should avoid supplementation due to insufficient safety data.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
3'-O-methylquercetin3'-methoxyquercetinquercetin 3'-methyl ethertamarixetin 7-methyl etherISOisorhamnetol3-methylquercetin
Frequently Asked Questions
What foods contain isorhamnetin naturally?
Isorhamnetin is found in onions, almonds, wine, and various fruits and vegetables. Red onions and almonds are among the richest dietary sources of this flavonol compound.
How is isorhamnetin different from quercetin?
Isorhamnetin is a methylated derivative of quercetin with a methoxy group at the 3' position. This structural difference may affect its bioavailability and antioxidant potency compared to quercetin.
What is the recommended dosage for isorhamnetin?
No recommended dosage exists for isorhamnetin supplementation since no human clinical trials have been conducted. Therapeutic doses have not been established in any population.
Can isorhamnetin help with gout or uric acid levels?
While laboratory studies show isorhamnetin inhibits xanthine oxidase enzyme, no human studies have tested its effects on uric acid levels or gout symptoms. Clinical evidence is needed.
Is isorhamnetin safe to take with other supplements?
Safety interactions with other supplements are unknown due to lack of human research. Theoretical interactions may occur with other antioxidants or compounds affecting drug metabolism enzymes.
What does current research show about isorhamnetin's effectiveness?
Current evidence for isorhamnetin is limited to in-vitro (laboratory) studies and basic research, with no human clinical trials or controlled studies published to date. While preliminary research suggests potential antioxidant and xanthine oxidase inhibitory properties, these findings cannot yet be applied to human health outcomes. Any health claims about isorhamnetin supplements remain scientifically unproven until rigorous clinical evidence is available.
Is isorhamnetin safe for pregnant women or children?
There is insufficient safety data on isorhamnetin supplementation in pregnant women, nursing mothers, or children, as no clinical studies have been conducted on these populations. Until human safety research is completed, pregnant and breastfeeding women should consult a healthcare provider before using isorhamnetin supplements. Similarly, isorhamnetin supplementation in children cannot be recommended without established safety data.
Does isorhamnetin interact with medications like xanthine oxidase inhibitors or uric acid medications?
No clinical interaction studies have been conducted between isorhamnetin supplements and medications such as allopurinol, febuxostat, or other common drugs. Since isorhamnetin may theoretically inhibit xanthine oxidase based on laboratory research, individuals taking xanthine oxidase inhibitor medications should consult their healthcare provider before supplementing. Without human trial data, potential interactions remain unknown and should be discussed with a healthcare professional before combining with any prescription medications.
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