How should oak bark be brewed and used? — Oak bark herbal tea, 50 g - Norden Natur

According to the label, this is a herbal tea: put 1–2 teaspoons of the bark in a cup, pour over boiling water, leave to steep for 10 minutes and strain. The label gives no other methods of preparation or regimens (gargling, baths, compresses, courses), so we do not give specific proportions, temperatures or durations for them.