Milk Thistle Extract has been traditionally used to support liver health.* Silymarin, the active complex found in Milk Thistle Extract, supports antioxidant activity.* 21st Century's standardized herbal extracts are thoroughly tested to assure specific levels of the important active ingredients are present for maximum benefit. freshness and label potency. No added sugar, salt, yeast, preservatives, artificial flavors or colors. 100% vegetarian formula