Ivy has been a popular supplement in Europe for more than 50 years and has been used by millions of people.Numerous clinical studies indicate ivy leaf extract is helpful for people who wish to build and maintain healthy lung and bronchial passageway function.Enzymatic Therapy's Ivy Extract contains glycosidic saponins, the key working compounds in ivy leaf. Each tablet provides 25 mg of dried ivy leaf extract, the same concentration used in popular European extracts.