Quercus robur, Q. pedunculata, Q. sessiliflora + other species.  Oak  Family: Fagaceae     
Oak inner bark, Tanner's bark    
TASTE: Astringent   ODOR: Slightly aromatic, none
ACTIONS
GROUP: The Skin & Mucous Membranes- Astringents
1. Astringent.[1,2,3]
2. Antiseptic.[1,2,3]
3. Hemostatic.[1,2,3]
4. Bitter tonic.
INDICATIONS
1. Diarrhea-[1,2,3] Gastritis. Dyspepsia. Enteritis. Gastro-intestinal catarrh.
2. Hemorrhages. Hemorrhoids-[1,2,3] as enema. Hematuria. Chillblains.
3. Tonsilitis-as gargle.[1,3] Chronic catarrhal conditions. Pharyngitis.[1]
4. Goitre.
5. Urinary incontinence.
6. Irritations, eruptions, ulcers.
7. Leukorrhea.
8. Liver disturbances.
Topically Hemorrhoids- as enema.[1,3] Leukorrhea- as douche.[1]
SPECIFIC INDICATIONS: Acute diarrhea, in frequent small doses.[1,3]
COMBINATIONS
PREPARATIONS
Dried Bark  1-2 g, or by decoction.[1,2]
Fluid Extract 1:1 in 25% alcohol  1-2 ml.[1,2]   0.5-5 ml.[3]
Local- Enema. Gargle. Lotion. Powder.[1,2]

Acorns - the fruit of the oak tree     
ACTIONS
1. Astringent.[3]
INDICATIONS
1. An old remedy for diarrhea, where they are powdered or grated and washed down with water.[3]
PREPARATIONS
Roasted acorns have been used as a coffee substitute.[3]
ORIGIN:  Europe and North America
DESCRIPTION: Large tree. The bark has a greyish external surface with occasional brown lenticels, a reddish brown inner surface with longitudinal striations. Fracture fibrous, showing projecting medullary rays.
References
Inner Path can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Constituents
Research

Constituents from oak bark (Quercus robur L.) inhibit degranulation and allergic mediator release from basophils and mast cells in vitro
Peter Lorenz, Miriam Heinrich, Manuel Garcia-Käufer, Franziska Grunewald, Silke Messerschmidt, Anja Herrick, Kim Gruber, Christiane Beckmann, Matthias Knoedler, Roman Huber, Carmen Steinborn, Florian C Stintzing, Carsten Gründemann
Abstract
Ethnopharmacological relevance: Oak bark has been used since ancient times in Europaen ethnomedicine because of its adstringent, antimicrobial and hemostatic features, e.g. as a remedy for the treatment of wounds and skin diseases.
Purpose: Oak bark tannins are considered as bioactive natural products, interacting with surface proteins of mucous membranes and might be beneficial for the treatment of allergic diseases. This study investigated the effect of an oak bark decoction (OBD) and isolated tannin fractions on the degranulation capacity and cytokine/chemokine release from rat basophilic cells and human mast cells in vitro, which are essential for the initiation of early- and late-phase allergic reactions.
Methods and methods: By chromatographic separation on Sephadex® LH-20 high- and low-molecular weight tannins were separated from OBD and the tannin composition analyzed by HPLC(DAD)-MSn. Then, the OBD and its fractions were tested in degranulation (ß-hexosaminidase activity) of allergen-specific-activated basophilic cells in a photometric assay.
Results: The OBD and the high-molecular tannin fraction showed a dose-dependent inhibition of cell degranulation. Furthermore, the OBD and particularly its high molecular weight tannin fraction exhibited an inhibitory activity on the IL-8-, IL-6- and TNF-a-secretion from stimulated human mast cells, detected and quantified by ELISA.
Conclusion: The OBD and its high-molecular weight tannins revealed an impact on allergic mediator release of basophilic cells and human mast cells and thereby provide a rationale for the topical treatment with OBD preparations.
J Ethnopharmacol 2016 Dec 24;194:642-650. doi: 10.1016/j.jep.2016.10.027. Epub 2016 Oct 8. PMID: 27725242 DOI: 10.1016/j.jep.2016.10.027 pubmed.ncbi.nlm.nih.gov  

Antimicrobial and antioxidative enrichment of oak (Quercus robur) bark by rotation planar extraction using ExtraChrom
Samo Andrensek, Breda Simonovska, Irena Vovk, Pia Fyhrquist, Heikki Vuorela, Pia Vuorela
Abstract
The multifunctional ExtraChrom instrument was used in the extraction of antimicrobial and radical scavenging components from oak (Quercus robur L.) bark. Milled and sieved oak bark was extracted with 80% (v/v) methanol solution in water on the ExtraChrom instrument using step-gradient in the preparative separation. Extracts were tested using agar diffusion method on Staphylococcus aureus, Enterobacter aerogenes and Candida albicans. Some extracts showed moderate bactericidal, fungicidal, bacteriostatic and fungistatic activity. The composition related to activity of the fractions and extracts was screened simultaneously by thin-layer chromatography (TLC) detected by UV and by spraying the plate with radical scavenging reagent 1,1-diphenyl-2-picrylhydrazyl (DPPH) to detect antioxidant activity. Thus, we could demonstrate the antiradical and antimicrobial activity of oak beneficial in the storage of wine against the oxidation and human microbial exposure.
Int J Food Microbiol 2004 Apr 15;92(2):181-7. doi: 10.1016/j.ijfoodmicro.2003.09.009.
PMID: 15109795 DOI: 10.1016/j.ijfoodmicro.2003.09.009 pubmed.ncbi.nlm.nih.gov