the link below should answer this question okay, let me know if it doesn't. :) best all-around herbal complex I've foudn for Liver Cleansing is Planetary Formula's Bupleurum Liver Cleanse.
Also, you can liver cleanse with a carrot salad! If you can manage to eat it at least 7 days in a row it will cleanse. I found it difficult, managed it just once and then moved on to oil/juice flushes and herbs.
Liver Cleansing salad:
1 cup of grated carrot, or the carrot pulp leftover from juicing.
1 tablespoon olive oil
1 tablespoon lemon juice
add anythign else you like for flavor, like raisens, ginger.
Beets are very cleansing, so hit the juice bar for a carrt/beet/ginger cocktail. Yummy! :) and try to eat beets once a week.