Milk thistle (Silybum marianum) is a type of plant native to the Mediterranean region and indigenous to western and central Europe.Acts as powerful antioxidant and protect cells from free radical damage, and has been shown to promote health liver function.Has been used to support health for more than 2,000 years. Milk thistle seeds contain an antioxidant flavonoid complex known as silymarin.Should be used under medical supervision.