Dandelion tincture is also excellent and is similar to milk thistle as it is bitter. Barberry is recommended as well by Dr. Schulze .
Also garlic is an excellent detoxifier. I would also recommend a good detoxifying tea.
Also recommended is that if your liver is not doing well to stick to a vegan diet for at least three months.
That said, I highly recommend doing a liver flush. The Hulda Clark one takes barely one evening and the next morning to do and the results are fantastic.