Oak Bark Astringent Decoction — Herbal Remedy for diarrhea, bleeding gums, sore throat, skin inflammation, hemorrhoids, weeping eczema | Living Netism

The oak (Quercus robur) was the most sacred tree to the Druids. The word "Druid" itself may derive from the Celtic word for oak (daur/doire). Oak bark, rich in tannins, was used as a powerful astringe