This tree grows in the northern, temperate climates of Europe, Asia, and North America. Many medicinal species of linden exist, with Tilia cordata and Tilia platyphyllos generally being the most available and studied. Regardless of species, the flowers are used as medicine. Though sometimes called lime flower, linden is not related to the familiar green lime fruit. Linden contains flavinoides (especially quercetin and kanempferol), caffeic, and other acids, muscilage (about 3%), tannins, volatile oil (0.02- 0.1%), and traces of benzodiazepine-like compounds. The flavinoides improve circulation. Linden is an antispasmotic, sweat-inducing, and sedative remedy. It relieves tensions and sinus headaches, helping to calm the mind and allow easy sleep. Linden is an excellent remedy for stress and panic, and is used to treat nervous palpitations. The flowers bring relief to colds and flu by reducing nasal congestion and soothing fever. Linden flowers are commonly taken to lower high blood pressure, particularly when emotional factors are involved. How much should I use? Linden tea is traditionally drunk as a digestive or, like chamomile, as an after dinner drink to induce peaceful sleep. Some people drink it to relieve headaches. Linden tea is an after-dinner staple in many European countries and can be enjoyed every day, safely.