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Rutin: Benefits, Uses, and Sources

Overview

Plain-English information for everyday use

1. What Is Rutin?

Key Takeaway

Rutin is a plant flavonoid found in foods like buckwheat, apples, and citrus. It is sometimes called “vitamin P,” but it is not actually a vitamin — most people take it to support healthy blood vessels and circulation.

Rutin is a flavonoid — a natural compound found in many plants, including buckwheat, apples, citrus fruit, and tea.Tartary buckwheat as a source of dietary rutin. J Agric Food Chem (PMID 14558761). Open Source ↗

You may see it called “vitamin P,” but that name is outdated: rutin is not a vitamin, your body does not require it, and there is no recommended daily amount for it. Chemically it is quercetin joined to a natural sugar, and your gut bacteria turn much of it into quercetin — the form your body absorbs.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

2. Do You Need Extra Rutin?

Key Takeaway

Rutin isn’t an essential nutrient, so there’s no such thing as being “low” on it or having a rutin deficiency. People choose it for a little extra blood-vessel and circulation support — not to fix a shortfall.

Unlike a true vitamin, rutin has no recommended daily amount and no deficiency state, so there are no warning signs of being “low” to watch for.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

Most people who consider rutin are looking for everyday support for their veins and capillaries, or want to round out a diet that’s light on flavonoid-rich foods like buckwheat, apples, citrus, and tea. Think of it as an optional addition rather than a gap you need to fill.

More generally, everyday symptoms can have many different causes and usually aren’t down to any single nutrient, so if something is bothering you, it’s best to check with your healthcare provider rather than reaching for a single supplement.

3. Who Should Be Careful or Avoid

Key Takeaway

Skip rutin supplements if you have a flavonoid allergy. If you are pregnant or breastfeeding, take blood-thinning medication, or are heading for surgery, talk with your healthcare provider first.

Anyone with a known allergy to rutin or related flavonoids should avoid rutin supplements.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

If you are pregnant or breastfeeding, there is not enough safety information for concentrated supplement amounts, so it is best to get flavonoids from ordinary foods and check with your healthcare provider before using a supplement.USP safety review of Styphnolobium japonicum flower & bud. Phytother Res. Open Source ↗

If you take a blood-thinning medication, talk with your doctor first, because rutin may add to its effect. If you take an anti-rejection medication (such as cyclosporine), be cautious, because rutin can lower its level. If you are scheduled for surgery, your provider may suggest pausing rutin beforehand.Influence of quercetin pretreatment on warfarin pharmacokinetics. PMC. Open Source ↗Quercetin/rutin and cyclosporine pharmacokinetics (P-gp/CYP3A4). Mol Med Rep (PMC). Open Source ↗Use of herbal medication in the perioperative period. ASA/AANA/SPAQI (PMID 29401084). Open Source ↗

If you are under active treatment supervised by a specialist

Talk to your prescribing specialist before taking rutin. It is an antioxidant, and for treatments that work by raising oxidative stress, some research raises the question of whether antioxidant supplements could interfere — your specialist can advise based on your specific plan.Antioxidant supplementation during clinical treatment (review). PubMed. Open Source ↗

4. How to Get the Best Results

Key Takeaway

Take rutin with a meal, support a healthy gut, and keep a moderate daily amount. Pairing it with vitamin C is popular; pairing it with quercetin is redundant.

Take rutin with a meal that contains some fat, which can help your body absorb it. Because rutin has to be converted by gut bacteria into its absorbable form, a healthy gut matters — a course of antibiotics can temporarily reduce that conversion.Improving quercetin bioavailability: systematic review & meta-analysis. PMC. Open Source ↗Conversion of rutin by the human gut microbiota. PMC. Open Source ↗

There is no official recommended amount, and rutin on its own has not been well studied at any specific level, so a moderate daily amount is the usual approach. Pairing rutin with vitamin C is a common combination, while taking it alongside a quercetin supplement is largely redundant, since rutin already becomes quercetin in the body.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗Combination effect of rutin and vitamin C. PMC. Open Source ↗

5. Side Effects to Know About

Key Takeaway

Rutin is generally well tolerated. Side effects, when they happen, are usually mild and temporary, and no tapering is needed to stop.

Rutin is generally well tolerated, especially in the amounts found in food. When side effects do happen with supplements, they tend to be mild and temporary — headache, flushing, an upset stomach, or a rash have been reported.USP safety review of Styphnolobium japonicum flower & bud. Phytother Res. Open Source ↗Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

Because very high amounts have not been well studied, it is sensible not to overdo it. Like other flavonoids, rutin may add to the effect of blood-thinning medication, so watch for unusual bleeding if you take those. There is no evidence rutin causes dependence, and you do not need to taper off it.Safety of quercetin for clinical application (Review). Int J Mol Med (PMID 16012761). Open Source ↗Dietary supplements and anticoagulant safety (review). PMC. Open Source ↗

6. What Research Suggests

Key Takeaway

Most human research is on rutin’s close chemical relatives, not rutin itself, and the evidence is limited. Rutin is not a treatment or cure for anything.

Most human research has studied rutin’s close chemical relatives — standardized “rutosides” — rather than rutin itself, and that research points to modest support for everyday leg-and-vein comfort, with the strength of the evidence rated only low to moderate.Flavonoid compounds — 2020 systematic review. Cochrane Database Syst Rev. Open Source ↗Systematic review of hydroxyethylrutosides. J Clin Pharm Ther (PMID 25683481). Open Source ↗

It is just as important to be clear about the limits: rutin taken on its own has not been tested in well-designed human trials, so its specific benefits are not established, and a related compound is being studied separately. In the lab and in animals rutin shows antioxidant activity, but that does not prove a benefit in people.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗Targeting PDI with isoquercetin (CATIQ Phase II). JCI Insight (PMID 30652973). Open Source ↗

7. Top Food Sources

Key Takeaway

Buckwheat is the richest common source; apple peel, citrus, capers, figs, and tea also contribute. Every source is a plant, so rutin is naturally vegan.

Buckwheat is the richest common food source of rutin — tartary buckwheat especially. Other good sources include apple peel, citrus fruit, capers, asparagus, figs, olives, and black or green tea.Tartary buckwheat as a source of dietary rutin. J Agric Food Chem (PMID 14558761). Open Source ↗

How much rutin a food contains varies a lot by variety and processing, and the peel and outer layers are usually richest. Because every source is a plant, rutin is naturally suitable for vegans and vegetarians.

Food	Relative rutin content
Buckwheat (especially tartary buckwheat)	Very highTartary buckwheat as a source of dietary rutin. J Agric Food Chem (PMID 14558761). Open Source ↗
Apple peel	Moderate
Citrus fruit	Moderate
Capers, asparagus, figs, olives	Lower
Black or green tea	Lower

8. What Body Systems Rutin Supports

Key Takeaway

Rutin is most associated with the circulatory system — supporting healthy blood vessels and capillaries.

Rutin is most associated with the circulatory system. It is traditionally linked to supporting capillary strength and maintaining the health of delicate blood vessels against everyday wear and tear.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

Laboratory and animal studies have also explored possible effects on other systems, but that work is early-stage and has not been confirmed in people.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

9. Frequently Asked Questions

Key Takeaway

Quick answers to the questions people ask most about rutin.

Is rutin a vitamin?

No. “Vitamin P” is an outdated name; rutin is a plant flavonoid, not an essential vitamin.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

Is rutin the same as quercetin?

They are closely related. Rutin is quercetin joined to a sugar, and the body converts rutin into quercetin; taking both at once is largely redundant.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

How long until it works?

There is no well-defined timeline. Rutin is absorbed slowly, so it has no immediate effect and any effect builds gradually.

Can I just eat buckwheat instead of a supplement?

Buckwheat — especially tartary buckwheat — is one of the best food sources of rutin.Tartary buckwheat as a source of dietary rutin. J Agric Food Chem (PMID 14558761). Open Source ↗

Is rutin safe?

For most people, yes, at normal amounts. See “Who Should Be Careful or Avoid” for the exceptions.USP safety review of Styphnolobium japonicum flower & bud. Phytother Res. Open Source ↗

10. How to Choose a Quality Supplement

Key Takeaway

Choose a product that states its rutin content, ideally 95% or higher, with third-party testing.

Look for a product that clearly states its rutin content, ideally at 95% purity or higher, with third-party testing and a certificate of analysis. Most rutin is sourced from the flower buds of the Japanese pagoda tree or from buckwheat.Sophora japonica: traditional uses & phytochemistry. J Ethnopharmacol (PMID 27085938). Open Source ↗

It is also worth knowing that an ordinary rutin supplement is different from the prescription rutoside products sold as medicines in some countries.Five-year O-(β-hydroxyethyl)-rutoside safety review. PMC. Open Source ↗

11. Your Genes & Rutin

Key Takeaway

Genes and gut bacteria shape how you process rutin — but the gut microbiome matters most, and no genetic test predicts how rutin will work for you.

How you process rutin depends partly on your genes and partly on your gut bacteria. Genes that handle quercetin vary from person to person — one common version of the COMT gene lowers that enzyme’s activity by about 40% — and other genes also play a part. This is normal variation, not a condition.COMT Val158Met (rs4680). PMC. Open Source ↗UGT1A1*28 reduced glucuronidation. PMC. Open Source ↗SULT1A1/UGT1A1 polymorphisms. PMC. Open Source ↗

In practice, the biggest individual difference comes from your gut microbiome, which converts rutin into the form your body can absorb. There is no genetic test that can tell you how well rutin will work for you; if a DNA result has flagged a variant, that is a conversation for your healthcare provider.Conversion of rutin by the human gut microbiota. PMC. Open Source ↗

12. Traditional Roots

Key Takeaway

Rutin is a modern discovery, but its main source plant has a long traditional history. Traditional use is not the same as proof.

Rutin itself was first isolated in 1842, but its main source plant has a long traditional history. In traditional Chinese medicine, the flower buds of the Japanese pagoda tree (“Huai Hua”) were used traditionally to support vascular integrity and healthy microcirculation.Rutin — background and isolation history (review). Saudi Pharm J (PMID 28344465). Open Source ↗Sophora japonica: traditional uses & phytochemistry. J Ethnopharmacol (PMID 27085938). Open Source ↗

Buckwheat and other rutin-rich plants also appear in European folk traditions connected with circulation. Traditional use of a plant is not the same as proof that purified rutin works.

13. The Story Behind the Science

Key Takeaway

From rue in 1842 to the outdated “vitamin P,” to modern absorbable forms and current research, rutin has a long and evolving story.

Rutin was first isolated from the herb rue in 1842, which is where its name comes from. In 1936 a Nobel laureate proposed a “vitamin P” linked to capillary health — a label dropped once rutin was shown not to be a vitamin.Rutin — background and isolation history (review). Saudi Pharm J (PMID 28344465). Open Source ↗

From the 1960s, chemists created more easily absorbed rutin derivatives used in Europe for everyday vein support. More recently, early laboratory research suggested rutin can interact with an enzyme involved in normal clotting — a preliminary, in-the-lab finding that led to studies of a related compound, not rutin itself.Five-year O-(β-hydroxyethyl)-rutoside safety review. PMC. Open Source ↗Molecular basis of rutin inhibition of protein disulfide isomerase (PDI). PMC. Open Source ↗Targeting PDI with isoquercetin (CATIQ Phase II). JCI Insight (PMID 30652973). Open Source ↗

14. Blood Tests That May Show Changes

Key Takeaway

There is no blood test for rutin itself. If you take blood-thinning medication, talk to your doctor before use, since flavonoids can interact with these therapies.

There is no blood test for rutin itself. Because it is not a vitamin, providers do not measure “rutin levels,” and there is no standard lab test to check whether you are getting enough.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

If you take blood-thinning medications, talk to your doctor before using rutin, since flavonoids can interact with these therapies. Rutin’s antioxidant nature could in principle affect certain color-based lab tests, but this has not been shown to be a real problem at normal intakes.Influence of quercetin pretreatment on warfarin pharmacokinetics. PMC. Open Source ↗Ascorbate oxidase minimizes antioxidant-vitamin assay interference. PMC. Open Source ↗

✓ Updated: June 2026

Rutin — Technical Reference

Technical Data

Detailed scientific and technical information

CLINICAL SUMMARY

Rutin

A plant flavonol glycoside and quercetin prodrug (quercetin-3-O-rutinoside) from buckwheat and the Japanese pagoda tree; not a vitamin and has no established dietary requirement.

Canonical name

Rutin (quercetin-3-O-rutinoside; sophorin/rutoside); CAS 153-18-4; C₂₇H₃₀O₁₆; MW 610.5PubChem CID 5280805 — Rutin. NIH/NLM/NCBI. Open Source ↗

Structure / function focus

Antioxidant flavonol glycoside; quercetin prodrug. Microvascular / venous-tone support. No established rutin-monotherapy application.

Safety profile

Favorable — mild, transient tolerability signals; no upper intake level established; food-level intake well toleratedUSP safety review of Styphnolobium japonicum flower & bud. Phytother Res. Open Source ↗Safety of quercetin for clinical application (Review). Int J Mol Med (PMID 16012761). Open Source ↗

Pregnancy / lactation

P-3 (Insufficient evidence) / T-U (Transfer unknown). See the pregnancy & lactation panel below.

Interaction burden

Low–moderate under a low-bioavailability caveat: vitamin-K-antagonist anticoagulant (monitor INR), an immunomodulator metabolized by P-gp/CYP3A4, and narrow-index P-gp/CYP substratesInfluence of quercetin pretreatment on warfarin pharmacokinetics. PMC. Open Source ↗Quercetin/rutin and cyclosporine pharmacokinetics (P-gp/CYP3A4). Mol Med Rep (PMC). Open Source ↗

Lab interference

None established — reducing-agent (Trinder-class) interference is class-plausible but rutin-unproven and low-risk at typical intakeAscorbate oxidase minimizes antioxidant-vitamin assay interference. PMC. Open Source ↗

Functional intake tiers

Dietary: food flavonoid; no reference intake
Functional: ~250–500 mg/day with food
Derivative tier: oxerutin / hydroxyethylrutosides 0.6–4 g/day — applies to the semisynthetic derivatives, not rutinRutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗Five-year O-(β-hydroxyethyl)-rutoside safety review. PMC. Open Source ↗

Monitoring

None routine; INR with concurrent vitamin-K-antagonist therapy. No rutin status assay exists.

Bottom line: Favorable tolerability; the human evidence base concerns standardized rutoside derivatives (microvascular/venous-tone support, limited certainty), not rutin monotherapy. Strict compound discipline applies — rutin, the semisynthetic derivatives, and the aglycone are distinct. No taper required on discontinuation.

1. Chemical Identity & Forms

Rutin is the flavonol glycoside quercetin-3-O-rutinoside (C₂₇H₃₀O₁₆; MW 610.5; CAS 153-18-4) — quercetin bearing a rutinose disaccharide at the 3-position. The aglycone is quercetin. Functionally rutin is a prodrug, deglycosylated by colonic microbiota to quercetin, the systemically relevant species.PubChem CID 5280805 — Rutin. NIH/NLM/NCBI. Open Source ↗Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗Conversion of rutin by the human gut microbiota. PMC. Open Source ↗

Forms include rutin trihydrate and enzymatically modified αG-rutin. The semisynthetic O-(β-hydroxyethyl)-rutosides (oxerutin and its principal component troxerutin) are distinct, better-absorbed venoactive agents used in clinical procedures in some regions and are not clinically interchangeable with rutin. Rutin is not a vitamin — the historical “vitamin P” label is obsolete.Five-year O-(β-hydroxyethyl)-rutoside safety review. PMC. Open Source ↗

Property	Value
Common name	Rutin
Synonyms	Quercetin-3-O-rutinoside, rutoside, sophorin; “vitamin P” (obsolete)
CAS · Formula · MW	153-18-4 · C₂₇H₃₀O₁₆ · 610.5PubChem CID 5280805 — Rutin. NIH/NLM/NCBI. Open Source ↗
Aglycone	Quercetin (the absorbed species after microbial cleavage)Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

Form	Note
Rutin (trihydrate)	Standard supplement form
αG-rutin	Enzymatically glucosylated; more water-soluble
Oxerutin / hydroxyethylrutosides (troxerutin)	Semisynthetic venoactive derivatives — distinct actives, not rutinFive-year O-(β-hydroxyethyl)-rutoside safety review. PMC. Open Source ↗

2. How It Works

Rutin has no defined high-affinity receptor; its core activity is antioxidant via hydrogen-atom and single-electron transfer (catechol B-ring + 3-OH) with transition-metal chelation. After oral intake the circulating moieties are quercetin phase-II conjugates (glucuronide, sulfate, isorhamnetin), not intact rutin, with attenuated antioxidant potency versus the aglycone.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗Improving quercetin bioavailability: systematic review & meta-analysis. PMC. Open Source ↗

Mechanistically, rutin is the lead small-molecule modulator of extracellular protein disulfide isomerase (PDI), a thiol isomerase in the coagulation pathway — the biochemical basis later explored with a related, better-absorbed flavonoid in the context of the same coagulation-pathway mechanism.Molecular basis of rutin inhibition of protein disulfide isomerase (PDI). PMC. Open Source ↗Targeting PDI with isoquercetin (CATIQ Phase II). JCI Insight (PMID 30652973). Open Source ↗

Target / action	Role
Free-radical scavenging (catechol B-ring + 3-OH)	AntioxidantRutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗
Transition-metal (Fe²⁺/Cu²⁺) chelation	Antioxidant
Protein disulfide isomerase (PDI) modulation	Coagulation-pathway mechanismMolecular basis of rutin inhibition of protein disulfide isomerase (PDI). PMC. Open Source ↗
Circulating species	Quercetin glucuronide / sulfate / isorhamnetin conjugatesImproving quercetin bioavailability: systematic review & meta-analysis. PMC. Open Source ↗

3. How the Body Handles It

Oral bioavailability is low and structure-dependent (rutin ≈ 20% of the quercetin glucoside). Absorption is microbiome-gated: colonic α-L-rhamnosidase and β-glucosidase cleave the rutinose to liberate quercetin, producing a delayed Tmax (~6–7.5 h). Quercetin then undergoes extensive presystemic UGT1A9/1A3, SULT1A1 and COMT metabolism; reported terminal half-lives span ~3.5–28 h.Improving quercetin bioavailability: systematic review & meta-analysis. PMC. Open Source ↗Conversion of rutin by the human gut microbiota. PMC. Open Source ↗

A fatty meal and formulation enhancers (cyclodextrin, phytosome, self-emulsifying systems) increase exposure; antibiotic-induced dysbiosis impairs the microbial conversion step.Conversion of rutin by the human gut microbiota. PMC. Open Source ↗

Parameter	Value
Oral bioavailability	Low (~20% of the quercetin glucoside)Improving quercetin bioavailability: systematic review & meta-analysis. PMC. Open Source ↗
Rate-limiting step	Colonic microbial deglycosylationConversion of rutin by the human gut microbiota. PMC. Open Source ↗
Tmax	Delayed ~6–7.5 h
Phase II enzymes	UGT1A9/1A3, SULT1A1, COMT
Terminal half-life	~3.5–28 h (wide range)

4. Organ System Effects

The signature association is cardiovascular and microvascular — support of capillary integrity and venous tone. Hepatic, neurologic and metabolic activities are reported in laboratory and animal models but remain predominantly preclinical. These are mechanistic / research context, not asserted applications.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

System	Association	Status
Cardiovascular / microvascular	Capillary integrity, venous tone	Primary associationRutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗
Hepatic	Antioxidant context	Preclinical
Nervous	Antioxidant / neuro context	Preclinical
Metabolic	Antioxidant / cell-signaling context	Preclinical

5. Functional Dosing Tiers

Dietary tier — food-derived flavonoid; no reference intake. Functional tier — ~250–500 mg/day with food (market practice, not a validated dose-finding result). Derivative tier — oxerutin / hydroxyethylrutosides 0.6–4 g/day (most-studied 2 g/day) applies to the semisynthetic derivatives, which are not rutin and whose intakes must not be transposed. No adequately powered rutin-monotherapy dose-ranging study exists.Systematic review of hydroxyethylrutosides. J Clin Pharm Ther (PMID 25683481). Open Source ↗Five-year O-(β-hydroxyethyl)-rutoside safety review. PMC. Open Source ↗Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

Tier	Range	Context
Dietary	Food flavonoid	No reference intake
Functional	~250–500 mg/day with food	Market practice (not a validated dose-finding result)Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗
Derivative (oxerutin / HR)	0.6–4 g/day	Applies to the semisynthetic derivatives — not rutinFive-year O-(β-hydroxyethyl)-rutoside safety review. PMC. Open Source ↗

6. Functional & Mechanistic Evidence

Supportive evidence (derivatives, not rutin): a Cochrane review of flavonoid venoactive compounds found a probable slight improvement in leg-comfort and swelling-related measures, with low-to-moderate certainty; a systematic review of hydroxyethylrutosides (15 randomized trials, 1,643 participants) reported a meaningful improvement in leg-comfort measures.Flavonoid compounds — 2020 systematic review. Cochrane Database Syst Rev. Open Source ↗Systematic review of hydroxyethylrutosides. J Clin Pharm Ther (PMID 25683481). Open Source ↗

Limits (rutin itself): rutin monotherapy has not been evaluated in an adequately powered randomized trial, so specific applications are unestablished. A related, better-absorbed flavonoid (isoquercetin) has been investigated for the same coagulation-pathway mechanism — that compound is not rutin, and its findings do not transfer to rutin.Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗Targeting PDI with isoquercetin (CATIQ Phase II). JCI Insight (PMID 30652973). Open Source ↗Molecular basis of rutin inhibition of protein disulfide isomerase (PDI). PMC. Open Source ↗

Evidence	Design	Finding (compound)
Flavonoid venoactive compounds	Meta-analysis (Cochrane)	Probable slight improvement; low–moderate certainty (rutosides)Flavonoid compounds — 2020 systematic review. Cochrane Database Syst Rev. Open Source ↗
Hydroxyethylrutosides	15 RCTs, n=1,643	Significant improvement in leg-comfort measures (HR — not rutin)Systematic review of hydroxyethylrutosides. J Clin Pharm Ther (PMID 25683481). Open Source ↗
Rutin monotherapy	—	Not adequately studiedRutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗
Isoquercetin (CATIQ)	Studied compound — not rutin	Investigated for the PDI / coagulation-pathway mechanism (isoquercetin)Targeting PDI with isoquercetin (CATIQ Phase II). JCI Insight (PMID 30652973). Open Source ↗

7. Genetic Variations

No rutin-outcome pharmacogenomic study exists; the following is inferential, based on the phase-II enzymes that process quercetin. The common COMT Val158Met variant lowers enzyme activity ~40% in carriers; UGT1A1 and SULT1A1 low-activity alleles further shift conjugate profiles. These are normal functional polymorphisms, framed as ordinary variation in how the body processes the flavonoid.COMT Val158Met (rs4680). PMC. Open Source ↗UGT1A1*28 reduced glucuronidation. PMC. Open Source ↗SULT1A1/UGT1A1 polymorphisms. PMC. Open Source ↗

In practice the dominant source of interindividual variability is gut-microbiome composition, which governs the rate-limiting deglycosylation step. There is no validated genotype-guided intake for rutin, and gene variants alone should not drive supplementation decisions.Conversion of rutin by the human gut microbiota. PMC. Open Source ↗

Gene / variant	Effect on processing
COMT Val158Met (rs4680)	~40% lower enzyme activity in Met carriersCOMT Val158Met (rs4680). PMC. Open Source ↗
UGT1A1*28	Reduced glucuronidationUGT1A1*28 reduced glucuronidation. PMC. Open Source ↗
SULT1A1*2	Low-activity alleleSULT1A1/UGT1A1 polymorphisms. PMC. Open Source ↗
Gut microbiome	Dominant factor — governs rate-limiting deglycosylationConversion of rutin by the human gut microbiota. PMC. Open Source ↗

8. Tolerability & What to Watch For

Rutin is generally well tolerated; food-level intake has no recognized toxicity, and a comprehensive safety review of the source plant reported no serious tolerability signals. Supplement-associated signals are mild and transient (gastrointestinal upset, headache, flushing, rash). No upper intake level is established, so very high intakes are uncharacterized.USP safety review of Styphnolobium japonicum flower & bud. Phytother Res. Open Source ↗Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗Safety of quercetin for clinical application (Review). Int J Mol Med (PMID 16012761). Open Source ↗

A nuance worth flagging for clinicians: the aglycone shows in-vitro genotoxic signals that are not reproduced in vivo and sit in the lowest regulatory hazard category, with rutin less active than the aglycone. At high flavonoid exposure, flavonoids interact with topoisomerase II in primary hematopoietic progenitors; concentrated supplement intake during pregnancy is therefore not established as safe, while dietary intake is benign. Additive antiplatelet effects and non-heme-iron chelation are theoretical.Safety of quercetin for clinical application (Review). Int J Mol Med (PMID 16012761). Open Source ↗Dietary flavonoids and topoisomerase-II interaction in human CD34+ cells. Carcinogenesis (PMID 17468513). Open Source ↗

Signal	Frequency	Notes
GI upset, headache, flushing, rash	Uncommon, mild, transient	Supplement-level intakeRutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗
Food-level intake	—	No recognized toxicityUSP safety review of Styphnolobium japonicum flower & bud. Phytother Res. Open Source ↗
High-dose intake	—	Uncharacterized; no upper intake level setSafety of quercetin for clinical application (Review). Int J Mol Med (PMID 16012761). Open Source ↗

9. Interactions to Be Aware Of

Screen under a low-bioavailability caveat. Vitamin-K-antagonist anticoagulant — a CYP2C9 and albumin-displacement interaction plus intrinsic antiplatelet activity; monitor INR on initiation and discontinuation. An immunomodulator metabolized by P-gp/CYP3A4 — rutin induces intestinal P-gp/CYP3A4 and can reduce its exposure; avoid the combination or monitor levels. Narrow-index P-gp/CYP substrates warrant caution. Antioxidant activity introduces a theoretical interaction with treatments that rely on reactive oxygen species — defer to the supervising specialist (see the routing note below).Influence of quercetin pretreatment on warfarin pharmacokinetics. PMC. Open Source ↗Dietary supplements and anticoagulant safety (review). PMC. Open Source ↗Quercetin/rutin and cyclosporine pharmacokinetics (P-gp/CYP3A4). Mol Med Rep (PMC). Open Source ↗Antioxidant supplementation during clinical treatment (review). PubMed. Open Source ↗

Agent	Mechanism	Management
Vitamin-K-antagonist anticoagulant	CYP2C9 + albumin displacement + antiplatelet activity	Monitor INRInfluence of quercetin pretreatment on warfarin pharmacokinetics. PMC. Open Source ↗
Immunomodulator (P-gp / CYP3A4 substrate)	Intestinal P-gp / CYP3A4 induction → reduced exposure	Avoid or monitor levelsQuercetin/rutin and cyclosporine pharmacokinetics (P-gp/CYP3A4). Mol Med Rep (PMC). Open Source ↗
Narrow-index P-gp / CYP substrates (e.g., digoxin)	Transporter / enzyme competition	Caution
Non-heme iron	Chelation	Separate intake by ~2 hRutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

10. Cautions & Who Should Avoid

Absolute caution: known hypersensitivity to rutin or related flavonoids — should not be used. Relative cautions: concurrent anticoagulant or antiplatelet therapy, the P-gp/CYP3A4 immunomodulator, narrow-index P-gp substrates, iron-deficiency states (chelation), and renal or hepatic impairment (limited data).Quercetin/rutin and cyclosporine pharmacokinetics (P-gp/CYP3A4). Mol Med Rep (PMC). Open Source ↗

Pregnancy & Lactation — P-3 (Insufficient evidence) | T-U (Transfer unknown)

Grade rationale: no reliable human or animal data on supplement-level rutin in pregnancy, and mechanism-based concern (topoisomerase-II interaction at high flavonoid exposure) cannot be ruled in or out; absence of evidence is not evidence of safety. Dietary flavonoid intake is benign-to-supportive. Lactation transfer is unstudied (T-U); the NIH lactation database (LactMed) is the reference of record. Intake context: rutin has no dietary reference intake (RDA), so this precaution concerns concentrated supplement-level intake during pregnancy — not dietary flavonoid intake from food, which is considered benign. Route by role: maternal-safety questions to the OB or midwife, milk-supply questions to a lactation consultant, infant-effect questions to the pediatrician.Dietary flavonoids and topoisomerase-II interaction in human CD34+ cells. Carcinogenesis (PMID 17468513). Open Source ↗USP safety review of Styphnolobium japonicum flower & bud. Phytother Res. Open Source ↗

If you are under active treatment supervised by a specialist

Talk to the supervising specialist before using rutin. Rutin is an antioxidant, and there is a theoretical possibility that antioxidant supplements could interfere with treatments that act through reactive oxygen species; the specific question to raise is whether to avoid antioxidant supplementation during active specialist-directed treatment.Antioxidant supplementation during clinical treatment (review). PubMed. Open Source ↗

10a. Patient Population Red Flags

Renal 🟡 (limited data); Hepatic 🟡; Pregnancy 🟠 at supplement level (dietary 🟢) — P-3; Lactation 🟡 — T-U; Pediatric 🟡; Geriatric 🟢 (🟠 with polypharmacy); Polypharmacy 🟠 — anticoagulant / P-gp-CYP3A4 immunomodulator / narrow-index substrates; Peri-procedure 🟠 — discontinue ~1–2 weeks beforehand for antiplatelet activity; Athletes 🟢 — not restricted in sport.Use of herbal medication in the perioperative period. ASA/AANA/SPAQI (PMID 29401084). Open Source ↗

10b. Drug-Nutrient Depletion

Nutrient	Effect
(None)	Rutin is a non-essential flavonoid and is not known to deplete any nutrient
Non-heme iron	Reduced absorption via chelation — separate rutin and iron intake by ~2 hoursRutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

10c. Lab Interference Panel

Net: none established. Rutin’s redox chemistry makes reducing-agent (Trinder / peroxidase-coupled) interference class-plausible but rutin-unproven and low-risk at typical intake. No threshold; no routine washout.Ascorbate oxidase minimizes antioxidant-vitamin assay interference. PMC. Open Source ↗

Panel	Rutin-specific interference
Thyroid	No
Cardiac	No
Reproductive hormones	No
Adrenal & stress	No
Vitamin panel	No
Specialized marker panels	No
Acute-phase markers	No
Glycemic	Theoretical only — reducing effect on peroxidase/Trinder glucose methods; unproven for rutin

10d. Monitoring Protocol Template

Baseline — none routine; INR if on or starting a vitamin-K-antagonist. 4–6 weeks and 12 weeks — INR if anticoagulated, otherwise clinical review. Annual — none specific. Watch for unusual bleeding with anticoagulant co-use. Discontinuation — no dependence or withdrawal, no taper; before a procedure, discontinue ~1–2 weeks for antiplatelet activity.Use of herbal medication in the perioperative period. ASA/AANA/SPAQI (PMID 29401084). Open Source ↗

11. Nutrient Synergies

Rutin plus vitamin C has been examined together in human nutrition research, and the two are a common antioxidant pairing. Flavonoid mixtures underlie the derivative venoactive evidence. Rutin plus quercetin is largely redundant, since rutin is itself a quercetin prodrug.Combination effect of rutin and vitamin C. PMC. Open Source ↗Systematic review of hydroxyethylrutosides. J Clin Pharm Ther (PMID 25683481). Open Source ↗Rutin: bioactivity and mechanisms (review). Saudi Pharm J (PMID 28344465). Open Source ↗

12. Lab Monitoring + Repletion

Status testing is not applicable: rutin is not a vitamin and has no status or functional biomarker — there is no “rutin level” and no repletion target (distinct from the lab-interference panel, which concerns assays affected by rutin). Plasma quercetin-conjugate measurement is a research tool, not a clinical assay. The only actionable monitoring point is INR with concurrent vitamin-K-antagonist therapy.Influence of quercetin pretreatment on warfarin pharmacokinetics. PMC. Open Source ↗

Item	Detail
Status assay	None — rutin is not a vitamin and has no status biomarker
Research measure	Plasma quercetin conjugates (research tool, not a clinical assay)
Actionable monitoring	INR with concurrent vitamin-K-antagonist therapyInfluence of quercetin pretreatment on warfarin pharmacokinetics. PMC. Open Source ↗

13. Traditional Medicine

Rutin is a modern isolate (first obtained 1842), but its principal source plant has documented traditional use: the immature flower buds of the Japanese pagoda tree (“Huai Hua”) are traditionally associated with vascular integrity and healthy microcirculation, and are recorded in the Chinese and European pharmacopoeias. Rutin-rich plants such as rue, buckwheat and elderflower also appear in European herbal traditions. Traditional source-plant use is not evidence of purified-rutin effect.Rutin — background and isolation history (review). Saudi Pharm J (PMID 28344465). Open Source ↗Sophora japonica: traditional uses & phytochemistry. J Ethnopharmacol (PMID 27085938). Open Source ↗

Tradition	Context
TCM — Sophora japonica buds (“Huai Hua”)	Vascular integrity / healthy microcirculationSophora japonica: traditional uses & phytochemistry. J Ethnopharmacol (PMID 27085938). Open Source ↗
European herbal (rue, buckwheat, elderflower)	Circulation / capillary support

14. Quality Control

Commercial rutin is extracted chiefly from Japanese-pagoda-tree flower buds (24–40% rutin) and secondarily from buckwheat (tartary-buckwheat seed 0.8–1.7% dry weight). Specify ≥95% rutin by HPLC/UV with a certificate of analysis; authenticity markers include genistein and sophoricoside. A comprehensive safety review of the source-plant flower and bud reported no serious tolerability signals and the ingredient is admitted to the U.S. dietary-supplement compendium. Distinguish crude from purified material, and keep the semisynthetic derivatives clearly separate — they are distinct actives, not rutin.Sophora japonica: traditional uses & phytochemistry. J Ethnopharmacol (PMID 27085938). Open Source ↗Tartary buckwheat as a source of dietary rutin. J Agric Food Chem (PMID 14558761). Open Source ↗USP safety review of Styphnolobium japonicum flower & bud. Phytother Res. Open Source ↗Five-year O-(β-hydroxyethyl)-rutoside safety review. PMC. Open Source ↗

Specification	Target
Source	Sophora japonica flower buds (24–40% rutin) or buckwheatSophora japonica: traditional uses & phytochemistry. J Ethnopharmacol (PMID 27085938). Open Source ↗
Purity	≥95% rutin by HPLC/UV
Documentation	Certificate of analysis
Authenticity markers	Genistein, sophoricoside

✓ Updated: June 2026

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.