What is Sophora japonica used for?

Sophora japonica is traditionally used for vascular support and antioxidant support. It is valued for flavonoids such as rutin and quercetin.

What are the main active compounds in Sophora japonica?

The flowers are commonly noted for high levels of flavonoids, especially rutin and quercetin. These compounds are associated with antioxidant and capillary-supporting effects.

How much Sophora japonica is typically taken?

Common supplemental amounts are often in the range of 100–500 mg per day, depending on the extract and product. Follow the label and consult a clinician for personalized dosing.

Is Sophora japonica safe for everyone?

Safety depends on the product and individual factors such as pregnancy, breastfeeding, and medical conditions. People taking medications or with bleeding or vascular disorders should consult a healthcare professional before use.

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Vitamin B

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Vitamin B6 (Pyridoxine)

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Sophora Japonica

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Sophora japonica is a flavonoid-rich plant traditionally used for vascular and antioxidant support.

Longevity Anti-inflammatory Cardiovascular Support Antioxidant

dose range

100–500 mg

1–2 times per day

Consumption

Take with meals to enhance absorption and reduce GI discomfort.

Not fat-soluble.

Best time

Split daily dose with meals, preferably morning and/or afternoon.

Description

Sophora japonica, or Japanese pagoda tree, is a traditional East Asian medicinal plant valued for its flowers’ high rutin and quercetin content, used for vascular health and as antioxidants.

benefits

Main effects with level of evidence

Moderate

Note on evidence

Clinical evidence supports benefits of rutin (from Sophora japonica) for vascular health and antioxidant effects, but direct studies on Sophora japonica extracts in humans are limited.

Antioxidant Activity

Moderate

Contains high levels of flavonoids like rutin and quercetin, which can scavenge free radicals and protect cells from oxidative stress.

Particularly relevant for: Longevity · General Wellness

S1 · Journal of Ethnopharmacology S6 · Examine.com – Rutin

Vascular Health Support

Moderate

Helps strengthen capillaries, reduce permeability, and may support conditions such as chronic venous insufficiency and varicose veins.

Particularly relevant for: Cardiovascular Support

S3 · WebMD – Rutin Monograph S5 · Phytotherapy Research

Anti-Inflammatory Effects

Limited

May reduce inflammatory cytokines and mediate inflammation-related pathways, aiding in the management of mild inflammatory conditions.

Particularly relevant for: Anti-inflammatory

S2 · International Journal of Molecular Sciences S6 · Examine.com – Rutin

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Generally well tolerated, but special care is needed in at-risk populations.

warning notices

Mild side effects may include headache, flushing, or stomach upset.
High doses and long-term use: insufficient safety data.
Contraindicated in pregnancy, breastfeeding, and bleeding disorders.
Potential for significant interaction with blood thinners.
Avoid use during pregnancy and breastfeeding due to lack of safety data.
Avoid use with anticoagulant or antiplatelet medications as bleeding risk may increase.
Use only under clinician supervision if you have a bleeding disorder.
Monitor closely if you are taking other supplements or drugs that affect coagulation.

Known interactions with medications

anticoagulants
antiplatelet drugs

Contraindications / special precautions

pregnancy
breastfeeding
bleeding disorders

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Sophora japonica and its main flavonoid, rutin, can interact with blood-thinning medications and supplements influencing coagulation.

May increase bleeding risk with anticoagulants or antiplatelet drugs.

drug · Anticoagulants (e.g., warfarin, heparin)

AvoidModerate

Why

Flavonoids may have blood-thinning properties and can potentiate effects of medications influencing coagulation.

recommendation

Do not combine Sophora japonica supplements with prescription blood thinners unless guided by a healthcare provider.

S3 · WebMD – Rutin Monograph S7 · European Medicines Agency – Herbal monograph: Sophorae flos

Vitamin C may enhance the bioavailability of rutin in Sophora japonica.

nutrient · Vitamin C

PairLimited

Why

Vitamin C can improve absorption and effectiveness of plant flavonoids.

recommendation

Consider co-administration with vitamin C for maximal benefit, if appropriate.

S3 · WebMD – Rutin Monograph S6 · Examine.com – Rutin

mechanisms of action

Brief explanations of how it works

Antioxidant Scavenging of Free Radicals

Rutin and quercetin in Sophora japonica neutralize free radicals, lowering oxidative stress.

S1 · Journal of Ethnopharmacology S6 · Examine.com – Rutin

Capillary Stabilization and Vascular Protection

Rutin strengthens capillary walls, reduces permeability, and supports vascular integrity.

S5 · Phytotherapy Research

Inflammatory Pathway Modulation

Flavonoids inhibit release of pro-inflammatory cytokines, mitigating inflammatory processes.

S2 · International Journal of Molecular Sciences

Sources & References

Primary literature and reviews on which these statements are based

7 sources

Journal of Ethnopharmacology

In vitro and animal studies on antioxidant activity of Sophora japonica extracts.

International Journal of Molecular Sciences

Experimental study on anti-inflammatory properties of Sophora japonica.

WebMD – Rutin Monograph

Overview of rutin including vascular benefits and interactions.

NIH Office of Dietary Supplements

Fact sheets on dietary flavonoids and supplement safety.

Phytotherapy Research

Review of rutin’s effects on vascular health and source plants.

Examine.com – Rutin

Summary of human trial evidence for flavonoid bioactivities.

European Medicines Agency – Herbal monograph: Sophorae flos

Regulatory evaluation of traditional use and safety.

Last updated: January 31, 2026

This information is for educational purposes only and does not replace medical advice.