The best answer is all of them. Herbal based liver aid supplement work best when stacked together as they work synergistically. I would get a liver aid supplement that contains TUDCA, NAC and milk thistle. The board sponsor n2bm.com makes a really good liver aid supplement that contains all 3 called N2guard. Check that out.
Start the liver aid on day 1 of your cycle and use it throughout your entire cycle brother