Comfrey is the king of the liver herbs, you first use the LBB capsules and to be safest do a few liver flushes and then the comfrey formulas are well known for the liver. I make the old LG (liver/gallbladder) formula of Dr. Christopher's, I also make two liver tonics, the one using the Virgina Snake Rt. is the most powerful herbal formula I make.
The best clue for liver health starts at the dinner table and not with what herb as a supplement. So I always suggest the orange juice fasting and proper diet.