BOTANICAL IDENTITY
The right name is the first step.
Also known as: Downy oak
A common name and photograph do not guarantee identification. Check the botanical name and part indicated on a traceable product.
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.
Mild diarrhea
Use of the monographed group; the source does not demonstrate a benefit specific to each species.
Read the sourceMinor skin or mouth irritations
Use of the monographed group; the source does not demonstrate a benefit specific to each species.
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?
The bark, not the acorn or leaf, is the medicinal part in this profile. Q. pubescens is included in the group of barks covered by the monograph. This does not mean that every experiment in the report was carried out with this species.
Constituents to know.
Their presence and quantity depend on the plant part and preparation.
- Tannins
- Their ability to bind to proteins provides a plausible explanation of local astringency; this is not sufficient clinical evidence.Read the reference
Local astringent action
The traditional-use framework includes mild diarrhea and minor irritation of the mouth or skin, depending on the preparation and route.
Read the referenceWhat this means for preparation.
To interpret a study, first check “cortex”, the species, then the route: rinsing the mouth and drinking a preparation produce different exposure.
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.
Scope of the evidence on oaks
- Type of research
- Shared EMA assessment
- Preparation concerned
- Bark from accepted species; heterogeneous experimental data.
- Observed results
- The assessment recognises pharmacological plausibility and a tradition of use.
- Limitations to consider
- No isolated trial of this species is presented here. A study on another species or on root bark is insufficient to characterize the product in this profile.
What can we take from this?
Astringent does not mean proven disinfectant. Oak does not treat all causes of diarrhea and does not remove the need to investigate its cause if it persists.
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.
DecoctionBark · Route: oral
Preparation described in the shared monograph.
Please note: Follow the product's package leaflet; concentrations are not interchangeable.
Read the sourceLocal preparationBark · Route: topical or oromucosal
Preparation described in the shared monograph.
Please note: Do not apply to an extensive lesion; do not swallow a mouthwash.
Read the source05 · BEFORE ANY USE
Precautions & contraindications.
This guidance does not cover every individual situation. Missing information is not a guarantee of safety.
Contraindications
- Allergy to oak. Hot baths are unsuitable in certain heart diseases or febrile infections.
Medicine interactions
- Tannins can alter the absorption of oral medicines: ask how to space doses.
Adverse effects
- Stop use if an unexpected reaction occurs; limited data do not mean absence of risk.
Pregnancy & breastfeeding
Pregnancy and breastfeeding: medicinal use is not recommended; insufficient data.
Children & adolescents
Medicinal use is not recommended under 18 years; insufficient data.
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 — quercus cortexAccessed on 09/10/2026
- EMA — final shared assessment of oak barksAccessed on 09/10/2026
A TOUCH OF SOLÉA
Myriam’s tip
Myriam is reviewing the tip for this profile.
Myriam
