Herb Pharm White Oak Liquid Herbal Extract Description. Liquid herbal Extract. White Oak. Quercus Alba. Inner Bark. We prepare our White Oak extract from the inner bark of the Quercus alba tree which is Custom Wildcrafted in its natural wild habitat. To assure optimal extraction of White Oaks bioactive compounds the inner bark is hand-harvested in early spring is carefully shade-dried and cleaned of outer bark and wood and is then thoroughly extracted. Our White Oak is never fumigated or irradiated. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose treat cure or prevent any disease. Shake well before using. Two to four times per day take 30 to 40 drops in a little water. Ingredients: Certified organic grain alcohol distilled water vegetable glycerine and white oak extractives.