Standardized Extract Dietary Supplement Mason Guarantee - Laboratory Tested Studied and Shown to promote healthy, vibrant liver function and help rid toxins from the body This product is a superior quality herbal extract that has been standardized by the principal active ingredient in the herb - silymarin. Standardized Herbal extracts maintain a consistent level of benefits in dose after dose. Mason Vitamins brings you the very best in herbal quality so you can feel the difference. To further enhance liver health, take this product with any one of Mason's quality lecithin products.