Contains estragole, an alkylbenzene, which is carcinogenic and genotoxic in rodents.

van den Berg, S.J.P.L., Restani, et al., P.. (2011). Levels of Genotoxic and Carcinogenic Compounds in Plant Food Supplements and Associated Risk Assessment. Food and Nutrition Science 2: 989-1010. Link

Traditional Herbal Medicine Registration (THMR).