An extract made from the urtica dioica plant, commonly known as nettle. It is included in some lubricants for its purported effects on libido; in traditional medicine, the root of the nettle plant is used as a powerful aphrodisiac.

Nettle is also used to treat asthma, hay fever, and a number of other conditions. It may work as an anti-inflammatory agent. While it is fairly safe and effective, it can cause serious side effects for some users. Nettle root extract is thought to be unsafe for pregnant women and for people who take blood pressure medications.