A bright light in liver health. Native to the Mediterranean region, milk thistle has been used in folk and traditional medicine for more than 3,000 years. Today, the herb is used to support healthy liver function addition to supporting healthy liver cleansing, milk thistle may also act as a powerful antioxidant that helps support your body's response to free radicals. Committed to crafting quality supplements that just work better, to help you shine brighter, Solaray Milk Thistle Seed Extract is guaranteed to contain 140 mg of silymarin, the group of active plant compounds found in milk thistle.