There are three isomers of silymarin: silibinin, isosilybin, and silybin. Of these, silymarin has the strongest activity and is a property of silymarin extract. Our milk thistle extract is made from the dried fruit of Silybum marianum G., the extract is usually standardized to contain 80% of total silymarin and is water soluble. Our silymarin is mainly used in cosmetics, health care products and food additives.