White oak bark, also known as Quercus alba, is a medicinal herb derived from the bark of the white oak tree, native to North America. It is known for its astringent properties, which make it useful in toning and tightening tissues. It is used topically in skincare products for its potential benefits on the skin. It is believed to help tone and tighten the skin, reduce inflammation, and soothe skin conditions such as eczema and dermatitis. It is often used topically as a poultice, wash, or mouthwash for various skin conditions such as wounds, cuts, rashes, and gum issues.

White oak bark contains compounds that have anti-inflammatory properties, which may help reduce inflammation in the body. It is often used to alleviate symptoms of inflammation-related conditions such as arthritis, hemorrhoids, and diarrhea. It has also been used to support digestive health. It is believed to help soothe the digestive tract, reduce diarrhea, and relieve symptoms of indigestion.

Due to its astringent and antimicrobial properties, white oak bark is used in mouthwashes and toothpastes to promote oral health. It may help reduce gum inflammation, alleviate mouth sores, and freshen breath.

White oak bark is rich in antioxidants, which are compounds that can help neutralize harmful free radicals in the body. This may contribute to its potential anti-aging and overall health-promoting effects. Some studies have suggested that white oak bark may have antimicrobial properties against certain bacteria and fungi, which may contribute to its traditional use for various skin and oral health issues.