White oak is distributed throughout the northeastern U.S. and Canada, although
it does occur further west as evidenced by the fact it is the state tree of
Connecticut, Maryland and Illinois. For centuries, the wood of the tree has been
used to build ships, wine barrels and authentic mission-style furniture.
White oak powdered bark, which contains up to 20% tannins, potassium, iron and vitamin
B-12, is added to tonics and teas or is encapsulated. The herb is also used to
make astringent washes and pastes for topical use.
