Advanced Nutrition by Zahler Silybum Marianum Powerful Liver Tonic General Heath Dietary Supplement Feel Better, Everyday Kosher Pareve Dairy Free Soy Free Powerful Liver Tonic The liver is essential for digestion, detoxification, blood sugar regulation and fat metabolism. Zahler's Milk Thistle helps to support healthy liver cells and the body's natural repair processes. It also has natural antioxidant activity.