There is no consensus among hepatologists about taking mik thistle, so for that reason I wouldn't do it.
That said, there are members here who have reported that their hepatologists had no problem with their patients taking it.
Some hepatologists say it's okay to take only before or after treatment itself and some say it's even okay to take during treatment.
I would definitely look to the advice of your own hepatologist in this matter, if you want to pursue it.