Nettle leaf, also known as Urtica dioica, is a perennial herb native to Europe, Asia, and North America. The leaves of the plant are used for medicinal and culinary purposes. Nettle leaf has been traditionally used to help reduce symptoms of allergies such as hay fever, it's also believed to have antihistamine properties. It is also traditionally used to help improve circulation, it's also believed to have vasodilatory properties. Nettle leaf is also traditionally used to help reduce symptoms of arthritis and to help reduce pain and inflammation. It is also believed to have diuretic properties and may help to increase urine output and reduce symptoms of water retention.