Dietary Supplement Health & longevity through the healing power of nature - that s what it means to Trust the Leaf.® Milk Thistle Extract is standardized to 80% silymarin, the key constituent that exerts a protective effect against substances potentially harmful to the liver.* Our Milk Thistle extract is carefully tested and produced to certified quality standards. Satisfaction guaranteed. Did you know? Nature s Way Standardized Milk Thistle extract is a technically advanced herbal product. Standardization assures specific measureable levels of important compounds that provide beneficial activity in the body. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent and disease.