Dietary Supplement. Premium extract. 80% silymarin. Health & longevity through the healing power of nature - that's what it means to trust the leaf. Milk Thistle Extract (silybum marianum) is standardized to 80% silymarin, the key constituent that exerts a protective effect to the liver. Questions? Call 1-800-9Nature or visit naturesway.com. 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, measurable levels of important compounds that provide beneficial activity in the body. (This statement has not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.)