# Ban Lan Gen (Isatis tinctoria)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/ban-lan-gen
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 6 / 10
**Category:** Traditional Chinese Medicine
**Also Known As:** Isatis indigotica, Isatis tinctoria, Woad root, Chinese indigo, Dyer's woad, Radix Isatidis, Blue dye root

## Overview

Ban Lan Gen (Isatis tinctoria) is a traditional Chinese herb containing isatin and indirubin as primary bioactive compounds. These compounds demonstrate potential [antiviral](/ingredients/condition/immune-support) and [anti-inflammatory](/ingredients/condition/inflammation) mechanisms through interferon pathway modulation and viral replication inhibition.

## Health Benefits

• Traditionally used for influenza and respiratory infections (evidence: traditional use only)
• May support [immune function](/ingredients/condition/immune-support) during colds and sore throat (evidence: traditional use only)
• Potential antiviral properties mentioned in preclinical data (evidence: preliminary, no human studies)
• Traditional detoxification support in Chinese Medicine (evidence: historical use only)
• May help with fever and tonsillitis according to TCM practices (evidence: traditional use only)

## Mechanism of Action

Ban Lan Gen's bioactive compounds isatin and indirubin exhibit antiviral activity by inhibiting viral RNA polymerase and interfering with viral protein synthesis. The herb's polysaccharides may stimulate [immune function](/ingredients/condition/immune-support) through macrophage activation and cytokine production enhancement. Indirubin specifically targets cyclin-dependent kinases, potentially reducing [inflammatory](/ingredients/condition/inflammation) responses in respiratory tissues.

## Clinical Summary

Current evidence for Ban Lan Gen relies primarily on traditional use patterns and in vitro studies demonstrating [antiviral](/ingredients/condition/immune-support) activity against influenza and other respiratory viruses. Small preliminary human studies suggest potential benefits for reducing cold duration and severity, but these lack proper controls and adequate sample sizes. Most research consists of laboratory studies showing antiviral effects at concentrations that may not be achievable through oral supplementation. Rigorous randomized controlled trials are needed to establish clinical efficacy and optimal dosing protocols.

## Nutritional Profile

Ban Lan Gen (Isatis tinctoria) root is primarily a medicinal herb rather than a nutritional food source, so macronutrient content is not nutritionally significant in typical therapeutic doses (3–15g dried root or 10–15mL liquid extract). Key bioactive compounds include: indigo and indirubin (alkaloid-type pigments, approximately 0.1–0.8% dry weight in root), which are the most studied active constituents; sinigrin (glucosinolate, approximately 0.5–1.2% dry weight), which hydrolyzes to allyl isothiocyanate; tryptanthrin (quinazoline alkaloid, trace amounts ~0.01–0.05% dry weight) with noted antimicrobial properties; epigoitrin (oxazolidinethione, a glucosinolate-derived compound, ~0.1–0.3% dry weight), considered the primary antiviral candidate in preclinical studies; polysaccharides (approximately 15–25% dry weight), which likely contribute to [immunomodulatory](/ingredients/condition/immune-support) effects; lignans including lariciresinol and syringaresinol (trace quantities); and organic acids including succinic acid and uridine. Mineral content includes modest amounts of zinc (~0.5–1.5 mg/100g dried root), iron (~5–10 mg/100g), and calcium (~200–400 mg/100g), though bioavailability from medicinal decoctions is not well characterized. Protein content is low (~3–6% dry weight, not a meaningful dietary source). Fiber content is approximately 20–30% dry weight (mixed polysaccharides and cellulose). Bioavailability note: epigoitrin and tryptanthrin demonstrate reasonable oral absorption in animal models; polysaccharide bioavailability is limited but may exert gut-level immunostimulatory effects. Most human pharmacokinetic data are absent.

## Dosage & Preparation

No clinically studied dosage ranges are available for Ban Lan Gen. Commercial glycerite products suggest 1 ml (1156 mg dry root equivalent) per serving, but this lacks clinical validation or standardization. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Ban Lan Gen is generally well-tolerated when used short-term, with occasional reports of mild gastrointestinal upset or allergic reactions in sensitive individuals. The herb may interact with immunosuppressive medications due to its immune-stimulating properties. Individuals with autoimmune conditions should exercise caution as the herb's immune-enhancing effects could potentially exacerbate symptoms. Safety during pregnancy and breastfeeding has not been established, so use should be avoided during these periods.

## Scientific Research

Despite mentions of [antiviral](/ingredients/condition/immune-support) and [anti-inflammatory](/ingredients/condition/inflammation) activities in preclinical data, the research dossier reveals no human clinical trials, RCTs, or meta-analyses have been conducted on Ban Lan Gen. No study designs, sample sizes, or clinical outcomes are available in the scientific literature.

## Historical & Cultural Context

In Traditional Chinese Medicine, Ban Lan Gen has been used for centuries to treat influenza, infections, fevers, colds, sore throat, and tonsillitis. It appears in traditional formulations like Banlangen Extract Tablets, often combined with other herbs such as dandelion and viola.

## Synergistic Combinations

Dandelion, Viola, Echinacea, Astragalus, Elderberry

## Frequently Asked Questions

### What is the typical dosage for Ban Lan Gen supplements?

Traditional dosing ranges from 15-30 grams of dried root per day, typically prepared as a decoction. Modern extracts are commonly standardized to 200-400mg taken 2-3 times daily during acute illness.

### How quickly does Ban Lan Gen work for cold symptoms?

Traditional use suggests effects may be noticed within 24-48 hours when taken at symptom onset. However, clinical data supporting specific timeframes is limited and individual responses vary significantly.

### Can Ban Lan Gen prevent viral infections?

While traditional Chinese medicine uses Ban Lan Gen preventively during flu seasons, there are no controlled studies proving prophylactic efficacy. Laboratory studies show antiviral activity, but clinical prevention data is lacking.

### Is Ban Lan Gen safe to take with prescription medications?

Ban Lan Gen may interact with immunosuppressive drugs and blood thinners due to its immune-stimulating and potential anticoagulant properties. Consult healthcare providers before combining with prescription medications, especially those affecting immune function.

### What's the difference between Ban Lan Gen and other immune herbs?

Ban Lan Gen specifically contains isatin and indirubin compounds with documented antiviral activity, distinguishing it from general immune herbs like echinacea. Its traditional use focuses specifically on respiratory viral infections rather than broad immune enhancement.

### Is Ban Lan Gen safe to take during pregnancy and breastfeeding?

There is limited safety data on Ban Lan Gen use during pregnancy and breastfeeding, so it is generally recommended to avoid supplementation during these periods unless directed by a healthcare provider. Traditional Chinese Medicine practice suggests caution with Ban Lan Gen in pregnant women, particularly in the first trimester. If you are pregnant or breastfeeding, consult with your healthcare provider before using this supplement.

### What does the clinical research actually show about Ban Lan Gen's effectiveness?

Most evidence for Ban Lan Gen comes from traditional use in Chinese Medicine rather than rigorous human clinical trials. Preliminary laboratory and animal studies suggest potential antiviral properties, but no substantial clinical research in humans has been published to confirm these effects. More high-quality research is needed to establish safety and efficacy in Western medical contexts.

### Is Ban Lan Gen safe for children, and at what age can kids take it?

Ban Lan Gen has been traditionally used in Chinese Medicine for children with colds and respiratory infections, but there is no established clinical evidence for safe pediatric dosing. Safety guidelines for children vary by preparation form and concentration, making professional guidance essential before giving Ban Lan Gen to kids. Consult a pediatrician or qualified herbalist before administering this supplement to children.

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