Agency for Healthcare Research and Quality (AHRQ): Milk Thistle
- Report on effects of herb on liver disease and cirrhosis, including clinical adverse effects.
- http://www.ahrq.gov/clinic/epcsums/milktsum.htm

Skye Herbals - Milk Thistle
- Milk Thistle actions, indications, and uses with clinical studies and discussion forum.
- http://www.skyeherbals.com/materia_medica/milk_thistle.php