There are two species of milk thistle; the most common and widely utilised is silybum marianum. Milk Thistle extract is made from the seeds of this plant, which contain 4-6% silybin, the active component of the extract which is used in medicines and health supplements. Milk Thistle is believed to be an effective liver tonic which supports general liver function and maintains healthy digestive function. Some studies show that milk thistle improves liver function and helps maintain healthy digestive function. Australian by Nature Liver Tonic Milk Thistle can be used for the symptomatic relief of nonñspecific dyspepsia, such as gastrointestinal discomfort. It may assist in the detoxification of the liver and can be utilised as a liver cleanser.