# Heartleaf (Houttuynia cordata)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/heartleaf
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 6 / 10
**Category:** Traditional Chinese Medicine
**Also Known As:** Houttuynia cordata, Yu Xing Cao, Dokudami, Fish Mint, Fish Leaf, Chameleon Plant, Bishop's Weed, Rainbow Plant

## Overview

Heartleaf (Houttuynia cordata) contains quercetin and chlorogenic acid as primary bioactive compounds that modulate [inflammatory pathway](/ingredients/condition/inflammation)s. These compounds work primarily by inhibiting NF-κB signaling and suppressing proinflammatory cytokine production.

## Health Benefits

• [Anti-inflammatory](/ingredients/condition/inflammation) effects: Preclinical studies show suppression of proinflammatory cytokines (TNF-α, IL-8, IL-1β) in cell and animal models
• Antiviral activity: In vitro studies demonstrate inhibition of HSV-2 replication through NF-κB pathway blockade
• Respiratory support: Mouse studies show improved survival and reduced lung inflammation in H1N1-induced acute lung injury
• Antimicrobial properties: Laboratory evidence indicates activity against bacterial biofilms including P. aeruginosa and S. aureus
• [Immune modulation](/ingredients/condition/immune-support): Animal research suggests restoration of Th17/Treg balance and enhanced IL-10 expression in influenza models

## Mechanism of Action

Heartleaf's quercetin and chlorogenic acid inhibit the NF-κB signaling pathway, reducing transcription of [inflammatory](/ingredients/condition/inflammation) genes. The compounds suppress proinflammatory cytokines including TNF-α, IL-8, and IL-1β through direct enzyme inhibition. Additionally, these bioactives interfere with viral replication by blocking NF-κB-dependent viral transcription processes.

## Clinical Summary

Current evidence for heartleaf comes primarily from preclinical studies rather than human trials. Cell culture studies demonstrate significant suppression of pro[inflammatory](/ingredients/condition/inflammation) cytokines, while in vitro [antiviral](/ingredients/condition/immune-support) studies show inhibition of HSV-2 replication. Mouse respiratory studies indicate potential benefits, though sample sizes and study durations remain limited. Human clinical data is lacking, making therapeutic efficacy claims premature.

## Nutritional Profile

Heartleaf (Houttuynia cordata) is primarily consumed as a medicinal herb and vegetable (especially in Southeast Asian cuisine), with the following characterized composition per 100g fresh weight: Macronutrients: Protein ~2.0–2.5g, Carbohydrates ~4.0–5.0g, Dietary fiber ~1.5–2.0g, Fat ~0.5g, Moisture ~85–90g, Calories approximately 25–30 kcal. Key Micronutrients: Potassium ~300–350mg, Calcium ~70–100mg, Magnesium ~20–30mg, Iron ~2–3mg, Zinc ~0.5–1.0mg, Phosphorus ~40–60mg, Vitamin C ~25–30mg (moderate bioavailability), Vitamin A precursors (beta-carotene) ~500–800 µg RAE. Primary Bioactive Compounds: (1) Decanoyl acetaldehyde (decanal) — the principal volatile constituent (~0.1–1.0% of essential oil), responsible for characteristic fishy odor and demonstrated [antimicrobial](/ingredients/condition/immune-support) activity; (2) Quercetin and Quercitrin (quercetin-3-rhamnoside) — flavonoids present at ~50–200mg/100g dry weight, with moderate oral bioavailability (~20–30% after intestinal [metabolism](/ingredients/condition/weight-management)); (3) Rutin ~10–50mg/100g dry weight; (4) Isoquercitrin; (5) Hyperoside; (6) Chlorogenic acid ~20–80mg/100g dry weight; (7) Houttuynin (sodium houttuyfonate, synthetic analog of decanoyl acetaldehyde) — used in standardized extracts; (8) Aristolactam alkaloids — present in trace amounts, toxicological significance under investigation; (9) Essential oil constituents including methyl-n-nonyl ketone, lauryl aldehyde, and capric acid (~0.05–0.08% of fresh plant). Bioavailability Notes: Flavonoid glycosides (quercitrin, rutin) require intestinal microbial hydrolysis for absorption, limiting systemic bioavailability to approximately 15–30%; Vitamin C content degrades significantly with heat processing (>50% loss upon cooking); Decanoyl acetaldehyde is highly volatile and largely lost during drying or cooking, meaning standardized extracts (houttuyfonate) are used in clinical/research contexts to ensure consistent dosing; Heavy metal accumulation potential exists if grown in contaminated soils, warranting sourcing consideration.

## Dosage & Preparation

No clinically studied human dosages are established. Animal studies used 50-200 mg/kg oral doses of supercritical extract in rats and 40 mg/kg/day of polysaccharides in mice. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Heartleaf is generally well-tolerated but may cause gastrointestinal upset in sensitive individuals. The herb may interact with anticoagulant medications due to its [anti-inflammatory](/ingredients/condition/inflammation) properties. Pregnant and breastfeeding women should avoid heartleaf due to insufficient safety data. Individuals with autoimmune conditions should consult healthcare providers before use, as [immune system](/ingredients/condition/immune-support) modulation effects are not fully characterized.

## Scientific Research

Currently, no human clinical trials, RCTs, or meta-analyses are available in the research literature. Evidence is limited to preclinical in vitro and in vivo animal studies, including mouse models showing polysaccharides at 40 mg/kg/day improved survival in H1N1 infection and flavonoid glycosides reduced lung [inflammation](/ingredients/condition/inflammation).

## Historical & Cultural Context

In East Asian traditional medicine (Chinese, Japanese, Korean systems), H. cordata has been used for centuries to treat inflammation, infections, and viral diseases, with historical records dating back to ancient texts. It continues to be used in folk medicine as a diuretic, detoxifier, and [anti-inflammatory](/ingredients/condition/inflammation) agent, often combined with other herbs.

## Synergistic Combinations

Astragalus, Elderberry, Echinacea, Andrographis, Reishi

## Frequently Asked Questions

### What is the active compound in heartleaf?

Heartleaf's primary bioactive compounds are quercetin and chlorogenic acid, which provide the anti-inflammatory and antiviral effects. These flavonoids and phenolic acids are concentrated in the leaves and stems of Houttuynia cordata.

### How much heartleaf should I take daily?

No standardized human dosage exists for heartleaf supplements due to lack of clinical trials. Traditional preparations typically use 15-30g of dried herb daily, but supplement concentrations vary widely requiring manufacturer guidance.

### Can heartleaf help with viral infections?

Laboratory studies show heartleaf extracts inhibit HSV-2 viral replication through NF-κB pathway blockade. However, these are in vitro results only, and no human studies have confirmed antiviral efficacy for any viral infections.

### Does heartleaf reduce inflammation markers?

Preclinical studies demonstrate heartleaf significantly reduces TNF-α, IL-8, and IL-1β inflammatory cytokines in cell and animal models. The anti-inflammatory effects occur through NF-κB pathway inhibition, though human confirmation is needed.

### Is heartleaf safe with blood thinners?

Heartleaf may enhance anticoagulant effects due to its anti-inflammatory properties affecting platelet function. Patients taking warfarin, heparin, or other blood thinners should consult physicians before using heartleaf supplements to avoid bleeding complications.

### Is heartleaf effective for respiratory health and lung support?

Preclinical studies in mice have shown that heartleaf may support respiratory function by reducing lung inflammation and improving survival outcomes in acute lung injury models induced by H1N1 virus. These findings suggest potential benefits for respiratory health, though human clinical trials are needed to confirm efficacy and optimal dosing for respiratory applications. The herb's anti-inflammatory properties appear to be the primary mechanism supporting lung tissue.

### What is the difference between fresh heartleaf and dried extract forms?

Fresh heartleaf contains volatile compounds and water-soluble constituents that may be lost during drying, while standardized dried extracts concentrate key bioactive compounds for consistent dosing. Extract forms typically offer greater convenience and shelf stability compared to fresh herb, which has a shorter lifespan and requires proper storage. The choice between forms depends on individual preference, availability, and whether standardized compound levels are desired for specific health goals.

### Who should avoid heartleaf supplementation?

Individuals taking anticoagulant or antiplatelet medications should consult a healthcare provider before using heartleaf, as preliminary evidence suggests potential blood-thinning properties. Pregnant and nursing women should avoid heartleaf supplementation due to limited safety data in these populations. Those with known hypersensitivity to plants in the Saururaceae family or with active bleeding disorders should also exercise caution and seek professional medical guidance.

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