Mad Barn Milk ThistleMilk Thistle provides antioxidant support for horses. It can help support healthy liver function A dried, powdered form of the seed of the Silybum marianum plant Milk Thistle, also known as St. Marys Thistle, is a Mediterranean plant that contains various active compounds collectively called silymarin which include silybin The main site of action of milk thistle is the liver and it has been well researched for its effects on liver disease in humans