BOTANICAL IDENTITY
The right name is the first step.
Also known as: Chamaenerion angustifolium
The EMA also covers Epilobium parviflorum; these are two distinct species.
An illustration is not enough to identify a plant for consumption. Do not forage for a species based solely on this profile.
01 · UNDERSTAND
Properties & uses.
Prostate-related urinary symptoms
Traditional use for difficulty starting urination or increased frequency; prior diagnosis is essential.
Read the sourceThe traditional uses described are not clinical proof of effectiveness. Evidence for one preparation cannot automatically be applied to another.
02 · UNDERSTAND THE ACTION
How does the plant act?
Willowherb aerial parts are traditionally used for urinary symptoms associated with previously assessed benign prostatic enlargement. The report shared by E. angustifolium and E. parviflorum describes experiments on extracts and molecules. It does not demonstrate an isolated effect specific to each species or a clinical reduction in prostate size.
Constituents to know.
Their presence and quantity depend on the plant part and preparation.
- Oenotheins and flavonoids
- Oenotheins A and B, along with certain flavonoids, are among the substances studied. Their isolated effects are not automatically those obtained with an infusion.Read the reference
Enzymes and inflammatory pathways
Experiments have studied lipoxygenase, hyaluronidase and other targets. They provide hypotheses without proving urinary relief in humans.
Read the referenceExperimental hormone metabolism
Inhibition of 5α-reductase or aromatase has been observed in laboratory systems. This does not make willowherb a clinical equivalent of a medicine acting on these enzymes.
Read the referenceWhat this means for preparation.
Check the species and aerial parts. A study of purified oenothein is not a study of the infusion; assessment of urinary symptoms remains a prerequisite.
03 · EXAMINE THE EVIDENCE
What the research shows.
A laboratory or animal result alone does not demonstrate a benefit in humans. Each result must be read alongside the preparation studied and its limitations.
Prostate cells: limited interpretation
- Type of research
- EMA report compiling in vitro experiments.
- Preparation concerned
- Isolated molecules and cultured prostate cells.
- Observed results
- Changes in enzymes or proliferation are described.
- Limitations to consider
- The concentrations, cells and isolated substances demonstrate neither cancer treatment nor prevention of its onset with herbal tea.
What can we take from this?
Experimental mechanisms do not allow traditional use to be extended to cancer, prostatitis or acute obstruction. Urinary retention or blood in the urine requires assessment.
Documentary review dated 09/10/2026. The references remain available to check the context.
04 · CHOOSE A PREPARATION
One plant, several preparations.
Only forms documented in this profile’s sources are presented.
InfusionAerial parts · Route: oral
05 · BEFORE ANY USE
Precautions & contraindications.
This guidance does not cover every individual situation. Missing information is not a guarantee of safety.
Contraindications
- Do not use in cases of known allergy to this plant.
Medicine interactions
- Interactions are not detailed here: have a pharmacist check treatments and the preparation.
Adverse effects
- No adverse effects reported at the time of the EMA assessment; monitoring is necessary.
Pregnancy & breastfeeding
Medicinal use is not recommended during pregnancy and breastfeeding due to insufficient data.
Children & adolescents
No relevant use under 18 years of age for this indication.
If symptoms persist, worsen or are unusual, consult a healthcare professional. In an emergency, contact the emergency services.
06 · PUTTING KNOWLEDGE INTO PRACTICE
Preparations & recipes.
No home recipe is provided in this profile. For an appropriate preparation, refer to the product leaflet and ask your pharmacist for advice.
07 · CHECK THE SOURCES
Sources for this profile.
- EMA — Epilobii herba: official dossierAccessed on 09/10/2026
- ANSES — precautions for plants in food supplements, June 2023 summaryAccessed on 09/10/2026
- EMA — assessment report on Epilobium angustifolium L. (Aerial parts)Accessed on 09/10/2026
Illustration: Flora von Deutschland, Österreich und der Schweiz — Otto Wilhelm Thomé (1885), via Wikimedia Commons · Public domain. View the original image and its licence. Image resized and converted to WebP.
A TOUCH OF SOLÉA
Myriam’s tip
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Myriam
