TUDCA or LIV52. I know NAC is good as well. I would combine either NAC or TUDCA with Liv.52.
Liv.52 should be ran year round, 2-3 caps a day. When you take liver damaging compounds, run TUDCA or NAC along side of it. During the cycle, and after the cycle for the duration you ran it for or if you get blood tests, till your liver is back to normal.