Dokudami (Houttuynia cordata): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Dokudami work in the body?

Dokudami (Houttuynia cordata) contains active compounds including quercetin, rutin, chlorogenic acid, and houttuynia alkaloids that contribute to its medicinal effects. These compounds demonstrate antimicrobial and anti-inflammatory properties through multiple pathways. Decanoyl acetaldehyde, a key constituent, has shown antimicrobial activity against various pathogens. The herb's flavonoids may also support immune function and reduce oxidative stress. Evidence level: C.

Does Dokudami interact with any medications?

Limited research exists on Dokudami's drug interactions. Due to its traditional use for respiratory and urinary conditions, individuals taking immunosuppressants, diuretics, or medications for chronic infections should exercise caution. The herb's antimicrobial properties could potentially interfere with antibiotic treatments, though clinical evidence is lacking. Always consult a healthcare provider before combining Dokudami with prescription medications. Evidence level: C.

What is the recommended dosage for Dokudami?

Traditional adult dosages for Dokudami include 15-30 grams of fresh herb or 3-9 grams of dried herb prepared as tea daily. Standardized extracts are typically taken at 500 mg twice daily. Dosage may vary based on the specific condition being addressed and individual factors. Start with lower doses to assess tolerance, as the herb has a strong odor that may cause gastrointestinal upset in some individuals. Evidence level: Traditional/C.

Is Dokudami safe during pregnancy?

Dokudami is considered unsafe during pregnancy and should be avoided, particularly in large doses. Traditional use and available evidence suggest potential risks to pregnancy, though specific mechanisms are not well documented. Breastfeeding women should also avoid this herb due to insufficient safety data. Women who are pregnant, nursing, or planning pregnancy should consult a qualified healthcare provider before using any herbal preparations. Evidence level: C.

What is Dokudami used for in traditional medicine?

Dokudami has been widely used in Japanese, Chinese, Korean, and Vietnamese traditional medicine for centuries. In Japanese folk medicine, it is primarily used for respiratory infections and pneumonia. Vietnamese medicine employs it for skin conditions and detoxification. Additional traditional uses include urinary tract infections and general antimicrobial support. The herb is valued across East and Southeast Asia for its broad-spectrum therapeutic applications. Evidence level: Traditional/C.

What are the side effects of Dokudami?

Common side effects of Dokudami include gastrointestinal upset and intolerance to its strong, distinctive odor. Rare allergic reactions have been reported, particularly in individuals with known allergies to plants in the Saururaceae family. The herb's potent smell may cause nausea in sensitive individuals. Most adverse effects are mild and resolve upon discontinuation. Those with plant allergies should exercise caution and consult a healthcare provider before use. Evidence level: C.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Houttuynia cordata (Dokudami) is an Asian medicinal and edible plant recognized for its anti-inflammatory, antibacterial, and antiviral properties [PMID:36145299, 36061012].

Background

Houttuynia cordata Thunb. is a rhizomatous, herbaceous, perennial plant widely distributed across Asian regions, including China, Japan, Korea, and North-East India [PMID:34539401, 36145299, 29605674].

Traditional uses

Traditionally used in China for treating pneumonia, lung abscess, cold, fever, mumps, and dysentery [PMID:34539401, 36145299]. It is also used in various cultures for muscular sprain and stomach ulcers [PMID:29605674].

Active compounds

Key phytochemical constituents include flavonoids, polysaccharides, volatile/essential oils (such as 2-undecanone and alpha-humulene), phenolic acids, and alkaloids (e.g., aristolactam B, piperolactam A) [PMID:36145299, 36480816, 15630185, 11794526, 37956635].

Mechanism of action

Mechanisms include activation of the Nrf2/HO-1 antioxidant signaling axis, inhibition of TLR4/NF-κB and NLRP3 inflammasome pathways, and regulation of the gut-lung axis [PMID:42273260, 39742094, 39218180]. It may also modulate the MAPK pathway and restore lipid metabolism in skin cells [PMID:40393586].

Clinical evidence

Evidence DUlcerative Colitis (Mice)

H. cordata-derived nanoparticles and polysaccharides reduced weight loss, preserved mucosal integrity, and inhibited pro-inflammatory cytokines [PMID:41205527, 36549805, 39742094]

Evidence DPneumonia/Lung Injury (Mice)

Homogeneous polysaccharides (HCPM) improved survival and reduced lung injury in H1N1 and MRSA coinfection models [PMID:40654358, 40973292]

Evidence DAsthma (Mice)

2-Undecanone reduced inflammatory cell infiltration and levels of IL-4, IL-5, IL-13, and IgE in BALF [PMID:36480816]

Evidence DAtopic Dermatitis (Mice)

Polysaccharides (HCP) reduced epidermal thickness, skin lesions, and mast cell infiltration [PMID:40393586]

Evidence DIschemic Brain Injury (Rats)

Extracellular vesicle-like particles suppressed ferroptosis via miR159a targeting ACSL4 [PMID:40890801]

Evidence DStreptococcus mutans

Safety & adverse effects

Potential embryotoxicity has been observed in zebrafish embryos, with active agents such as oleanolic acid and aristolactam AII affecting PI3K-Akt and MAPK pathways [PMID:36668893]. Some limitations in development are noted due to the presence of aristolochic acid alkaloids [PMID:38077358].

Pregnancy & lactation

Potential embryotoxicity observed in animal models (zebrafish) [PMID:36668893].

Evidence summary

The majority of evidence is derived from in vitro studies and animal models (Level D) and comprehensive reviews (Level C). There is a lack of human clinical trial data in the provided abstracts.

PubMed sources

1.PMID: 39742094 (2024) — Houttuynia cordata-Derived Exosome-Like Nanoparticles Mitigate Colitis in Mice via Inhibition of the NLRP3 Signaling Pathway and Modulation of the Gut Microbiota. · International journal of nanomedicine
2.PMID: 40050867 (2025) — Antiviral treatment for viral pneumonia: current drugs and natural compounds. · Virology journal
3.PMID: 37901360 (2023) — Identifying the Potential of miRNAs in Houttuynia cordata-Derived Exosome-Like Nanoparticles Against Respiratory RNA Viruses. · International journal of nanomedicine
4.PMID: 40654358 (2025) — An anti-complement homogeneous polysaccharide from Houttuynia cordata ameliorates acute pneumonia with H1N1 and MRSA coinfection through rectifying Treg/Th17 imbalance in the gut-lung axis and NLRP3 inflammasome activation. · Acta pharmaceutica Sinica. B
5.PMID: 34539401 (2021)

Dokudami

Sources & Citations

Calculate a safe dose of Dokudami