7 Research Backed Benefits of Milk Thistle Extract for Horses Mad Barn Milk thistle (Silybum marianum) is one of the most well known herbs for liver support, but its benefits go beyond just that. Here's why it's considered good for you. Imagine the benefits of Glutathione 500 mg Plus 21st Century Vitamins 21st Century Vitamins The active antioxidant compound within milk thistle is the flavonoid complex called Silymarin. This antioxidant is one of the most powerful liver detoxifying agents. It helps to boost glutathione and superoxide dismutase Glutathione + Milk Thistle with Setria Swanson Vitamins