Sundown Naturals Standardized Milk Thistle with Dandelion, Fennel and Licorice provides you with well-rounded herbal support. Milk Thistle has been used in Greek health practices for over 2,000 years, and as a supplement, it helps to support the liver and maintain healthy liver function. It contains silymarin, a flavonoid that helps support the structure of the outer cell membrane of liver cells. Milk Thistle also possesses antioxidant properties that may help fight cell-damaging free radicals in the body.