Arimidex Liver Effect

Just started taking 0.25mg Arimidex 3-4 days per week, to go with my T shots. As Arimidex has a liver toxicity, at what level of Arimidex would I need to start to add in anything to help the liver, i.e. Milk Thistle.

also…big thanks to KSMan for all the info and knowledge…very much appreciated.