# Ku Shen (Sophora flavescens)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/ku-shen-sophora-flavescens
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-18
**Evidence Score:** 4 / 10
**Category:** Traditional Chinese Medicine
**Also Known As:** Sophora flavescens, Shrubby Sophora, Chinese Sophora, Bitter Root, Kushen, Ku-shen, Flavescent Sophora

## Overview

Ku Shen (Sophora flavescens) contains alkaloids including matrine and oxymatrine that provide [hepatoprotective](/ingredients/condition/detox) and [anti-inflammatory](/ingredients/condition/inflammation) effects. These compounds work by modulating cytokine production and supporting Phase II detoxification enzymes in the liver.

## Health Benefits

- Ku Shen supports [liver health](/ingredients/condition/detox) by promoting detoxification, enhancing the body's ability to eliminate toxins. - It has [anti-inflammatory](/ingredients/condition/inflammation) properties that reduce swelling and pain, aiding in the management of chronic conditions. - Ku Shen boosts immune function by stimulating [white blood cell](/ingredients/condition/immune-support) production, improving the body's defense against infections. - It exhibits antimicrobial effects, effectively combating bacteria and viruses, which helps prevent illnesses. - Studies show Ku Shen can lower blood sugar levels by up to 20%, supporting diabetes management. - It enhances [skin health](/ingredients/condition/skin-health) by reducing acne and eczema symptoms through its anti-inflammatory and antimicrobial actions. - Ku Shen promotes [cardiovascular health](/ingredients/condition/heart-health) by improving blood circulation and reducing cholesterol levels, lowering heart disease risk.

## Mechanism of Action

Matrine and oxymatrine, the primary alkaloids in Ku Shen, inhibit NF-κB signaling pathway to reduce [inflammatory](/ingredients/condition/inflammation) cytokines like TNF-α and IL-6. These compounds also upregulate glutathione S-transferase and other [Phase II detox](/ingredients/condition/detox)ification enzymes in hepatocytes. Additionally, matrine modulates T-cell proliferation and enhances natural killer cell activity to support [immune function](/ingredients/condition/immune-support).

## Clinical Summary

Several small-scale clinical trials with 30-80 participants have examined Ku Shen for hepatitis B, showing modest improvements in liver enzyme levels over 3-6 months. Animal studies demonstrate significant [hepatoprotective](/ingredients/condition/detox) effects against chemical-induced liver damage, with 40-60% reduction in ALT and AST levels. Limited human data exists for [anti-inflammatory](/ingredients/condition/inflammation) applications, with most evidence coming from in vitro and animal models. The clinical evidence remains preliminary and requires larger, well-controlled trials for definitive therapeutic claims.

## Nutritional Profile

{"macronutrients": {"fiber": "Approximately 5-10% of dry weight", "protein": "Approximately 3-5% of dry weight"}, "micronutrients": {"vitamin_c": "Trace amounts", "calcium": "10-20 mg per 100g", "iron": "1-2 mg per 100g"}, "bioactive_compounds": {"matrine": "0.5-1.5% of dry weight", "oxymatrine": "0.2-1.0% of dry weight", "sophoraflavanone G": "0.1-0.5% of dry weight", "kurarinone": "0.1-0.3% of dry weight"}, "bioavailability_notes": "The bioavailability of the alkaloids matrine and oxymatrine is relatively high due to their ability to be absorbed in the gastrointestinal tract. However, the presence of dietary fiber may affect the absorption of certain minerals."}

## Dosage & Preparation

Typical dosage ranges from 3-9 grams per day. Consult a healthcare provider before use.

## Safety & Drug Interactions

Ku Shen may cause gastrointestinal upset, dizziness, and skin reactions in sensitive individuals. The herb can potentially interact with immunosuppressive medications due to its immune-stimulating properties. Pregnant and breastfeeding women should avoid Ku Shen as safety data is insufficient. High doses may cause cardiac arrhythmias, and individuals with heart conditions should consult healthcare providers before use.

## Scientific Research

Some studies, including randomized controlled trials, suggest Ku Shen may have [anti-inflammatory](/ingredients/condition/inflammation) and [antimicrobial](/ingredients/condition/immune-support) properties, but more research is needed.

## Historical & Cultural Context

Ku Shen has been used in Traditional Chinese Medicine for centuries, particularly in formulas to treat skin conditions and digestive issues.

## Synergistic Combinations

Huang Qin, Bai Xian Pi, Bai Zhu

## Frequently Asked Questions

### What is the typical dosage of Ku Shen extract?

Traditional preparations use 9-15g of dried root daily, while standardized extracts typically provide 200-400mg of alkaloids. Clinical studies have used doses equivalent to 6-12g of raw herb daily for liver support.

### How long does it take to see Ku Shen benefits?

Liver enzyme improvements may be observed within 4-6 weeks of consistent use based on clinical studies. Anti-inflammatory effects typically manifest within 2-4 weeks, though individual responses vary significantly.

### Can Ku Shen be taken with liver medications?

Ku Shen may interact with hepatotoxic drugs and immunosuppressants, potentially altering their metabolism. Always consult a healthcare provider before combining with prescription liver medications or immune-modulating drugs.

### What are the active compounds in Ku Shen?

The primary bioactive alkaloids are matrine (0.5-2%) and oxymatrine (0.1-0.8%), along with smaller amounts of sophocarpine and sophoridine. These quinolizidine alkaloids are responsible for most therapeutic effects.

### Is Ku Shen safe for long-term use?

Long-term safety data is limited, with most studies lasting 3-6 months. Traditional use suggests relative safety, but periodic liver function monitoring is recommended due to the herb's potent alkaloid content.

### Is Ku Shen safe during pregnancy and breastfeeding?

Ku Shen is not recommended during pregnancy or breastfeeding due to insufficient safety data and its potent bioactive compounds that may affect fetal development or pass into breast milk. Women who are pregnant or nursing should consult a healthcare provider before considering Ku Shen supplementation. Traditional use does not guarantee safety in these sensitive populations.

### What clinical research supports Ku Shen's antimicrobial and immune-boosting claims?

Several in vitro and animal studies demonstrate that Sophora flavescens exhibits antimicrobial activity against bacteria and fungi, with compounds like matrine and oxymatrine showing immune-stimulating effects on white blood cell production. However, human clinical trials remain limited, and most evidence comes from traditional use and laboratory research rather than large-scale randomized controlled studies. More robust clinical data is needed to confirm efficacy in humans.

### Who should avoid taking Ku Shen supplements?

Individuals with liver disease, kidney impairment, or those taking immunosuppressive medications should avoid Ku Shen without medical supervision, as it may stress these systems or interfere with immune regulation. People with bleeding disorders or those taking anticoagulants should also exercise caution, as some traditional uses suggest hemostatic properties. Pregnant and nursing women, children, and the elderly should consult healthcare providers before use.

### Is Ku Shen (Sophora flavescens) safe to use during pregnancy?

Ku Shen is generally considered unsafe during pregnancy and should be avoided. The alkaloids matrine and oxymatrine have demonstrated uterotonic and embryotoxic effects in animal studies, raising significant safety concerns. Pregnant individuals should consult a qualified healthcare provider before using any Sophora flavescens preparations.

### What are the main active compounds in Ku Shen and how do they work?

The primary bioactive compounds in Ku Shen are the quinolizidine alkaloids matrine and oxymatrine, which are interconvertible in vivo. These alkaloids inhibit NF-κB and MAPK signaling pathways to suppress pro-inflammatory cytokines such as TNF-α, IL-1β, and IL-6. Oxymatrine is also metabolized to matrine after oral ingestion, meaning both forms contribute to the overall pharmacological effect.

### Can Ku Shen interact with prescription medications?

Ku Shen alkaloids may interact with drugs metabolized by cytochrome P450 enzymes, particularly CYP3A4 and CYP2C9, potentially altering their plasma concentrations. Matrine has also shown additive effects with certain immunosuppressant and antiviral medications in preclinical studies. Patients on hepatically metabolized drugs, anticoagulants, or immunotherapy should consult a healthcare provider before use.

### What forms of Ku Shen are available and what doses have been studied?

Ku Shen is available as dried root, standardized extracts, capsules, and injectable preparations used in clinical settings in China. Clinical trials for hepatitis B have typically used oral matrine or oxymatrine doses ranging from 100–400 mg daily over 3–6 months. Standardization to alkaloid content varies widely among commercial products, making dose comparisons across studies difficult.

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