The leaves of the witch hazel plant, which grows throughout most of North America, have more than 30 traditional medicinal uses, such as reducing inflammation and bleeding. An ointment (available in most health food stores) made from witch hazel can be applied to the skin to treat bruises and cuts and to tighten stretched (distended) veins and restore blood vessel tone.
Witch hazel is recommended for external use. Some people drink witch hazel tea, but the correct dosage is uncertain. Consuming too much witch hazel can cause nausea, vomiting, and constipation.
WebMD Medical Reference from Healthwise