Iris pseudacorus (Iris pseudacorus): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Iris pseudacorus work as an astringent?

Iris pseudacorus contains tannins and iridin compounds that provide its astringent action. The tannins bind to proteins in mucous membranes and skin, creating a protective layer that reduces secretions and tightens tissues. This mechanism explains its traditional use for diarrhea and wound healing. Flavonoids contribute additional anti-inflammatory effects. Evidence level: C (traditional use with limited clinical data).

Is Iris pseudacorus safe during pregnancy?

No, Iris pseudacorus is considered unsafe during pregnancy and should be avoided. The rhizome contains compounds that may stimulate uterine contractions and cause significant gastrointestinal distress. Traditional herbal sources explicitly contraindicate its use in pregnant women. Women who are pregnant or breastfeeding should not use this herb internally or topically. Evidence level: C.

What is the recommended dosage for yellow flag iris rhizome?

Traditional adult dosages include 1-2 grams of dried rhizome prepared as tea for internal use, though this requires caution due to potential toxicity. For topical use, a decoction can be applied to wounds or skin conditions. Internal use should be limited and supervised by a qualified practitioner. Large doses can cause serious adverse effects. Evidence level: C (traditional use).

Does Iris pseudacorus interact with any medications?

No well-documented drug interactions exist for Iris pseudacorus in clinical literature. However, its tannin content may theoretically reduce absorption of certain oral medications if taken simultaneously. The herb's gastrointestinal irritant properties could compound effects of other GI-irritating substances. Patients taking prescription medications should consult a healthcare provider before internal use. Evidence level: C.

What are the side effects of Iris pseudacorus?

Common side effects include gastrointestinal irritation, nausea, and vomiting, particularly with excessive internal doses. Contact with fresh rhizome may cause skin irritation or dermatitis in sensitive individuals. Large internal doses risk more severe toxicity. People with gastric ulcers should avoid internal use entirely due to mucosal irritation potential. 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

Iris pseudacorus (yellow flag) is a widespread emergent macrophyte used extensively in phytoremediation for removing nutrients and metals from wastewater [PMID: 25254420, 25529785, 41699015].

Background

Iris pseudacorus is a macrophyte native to Europe, the Mediterranean Basin, and western Asia, and has become an invasive species in various global ecozones [PMID: 37050136]. It is commonly utilized in constructed wetlands and floating treatment wetlands for water restoration [PMID: 41699015, 36669313].

Traditional uses

Irises are aromatic and medicinal plants that have long been employed by traditional healers in many cultures for the treatment of different infectious diseases [PMID: 38104072].

Active compounds

The rhizomes are rich in phenolic compounds, with 80% belonging to the tannin group [PMID: 33412463]. Identified compounds include flavonoids, isoflavonoids, xanthones, phenolics, and specific acids such as gallic, coumaric, cinnamic, chlorogenic, neochlorogenic, ferulic, and caffeic acids [PMID: 36997571, 27356596]. Specific identified compounds include gallocatechin [PMID: 33412463], kaempferol, quercetin, hispidulin, daidzein, genistein, formononetin, mangiferin, and isomangiferin [PMID: 27356596].

Mechanism of action

Rhizome extracts exhibit antibacterial activity against Gram-positive (S. aureus, E. faecalis) and Gram-negative (P. aeruginosa, K. pneumoniae) pathogens [PMID: 33412463]. Gallocatechin specifically combats S. aureus biofilm [PMID: 33412463]. The plant also shows enzyme inhibition potential against α-glucosidase, tyrosinase, and lipase [PMID: 36997571].

Clinical evidence

Evidence DBacterial Infections

Methanolic extracts of rhizomes showed antibacterial activity against S. aureus, E. faecalis, P. aeruginosa, and K. pneumoniae, including antibiotic-resistant clinical isolates [PMID: 33412463]

Evidence DCancer (In vitro)

Rhizome extract acted against human cancer cell lines, specifically the estrogen-positive MCF-7 breast cancer cell line (IC50 = 11.75 µg/mL) [PMID: 33412463]

Evidence DOsteoporosis (In vitro)

Yellow flag iris extract (YFIE) enhanced bone nodule formation, stimulated alkaline phosphatase activity and collagen type I secretion in osteoblasts, and attenuated the differentiation of macrophages to osteoclasts [PMID: 23227798]

Evidence DParasitic Diseases (In vitro)

Non-polar fractions showed significant antiprotozoal activity against Plasmodium falciparum, Trypanosoma brucei brucei, T. b. rhodesiense, T. cruzi, and Leishmania infantum [PMID: 38104072]

Evidence summary

The current evidence is limited to in vitro studies (cell lines and assays) and environmental phytoremediation experiments; there are no clinical trials or systematic reviews regarding human therapeutic use.

PubMed sources

1.PMID: 25254420 (2015) — Metal-Dependent Root Iron Plaque Effects on Distribution and Translocation of Chromium and Nickel in Yellow Flag (Iris pseudacorus L.). · International journal of phytoremediation
2.PMID: 37050136 (2023) — Wrack Burial Limits Germination and Establishment of Yellow Flag Iris (Iris pseudacorus L.). · Plants (Basel, Switzerland)
3.PMID: 25529785 (2015) — Brackish Eutrophic Water Treatment by Iris pseudacorus L.-Planted Microcosms: Physiological Responses of Iris pseudacorus L. to Salinity. · International journal of phytoremediation
4.PMID: 23656932 (2013) — Influence of initial pesticide concentrations in water on chlorpyrifos toxicity and removal by Iris pseudacorus. · Water science and technology : a journal of the International Association on Water Pollution Research
5.PMID: 29964779 (2016)

Iris pseudacorus

Sources & Citations

Calculate a safe dose of Iris pseudacorus