From ancient Greece to the present, nettle has been documented for its traditional use in treating coughs, tuberculosis, and arthritis and in stimulating hair growth. Test tube studies show that nettle leaf has anti-inflammatory actions. These actions are thought to be caused by nettle preventing the body from making inflammatory chemicals known as prostaglandins. Quercetin is used for its anti-histamine and anti-inflammatory properties. Quercetin also helps protect LDL cholesterol from being damaged and also has anti-estrogenic effects.