My liver has been a big problem over the years too! Its now alot stronger since Liver Flushing regularly over a 18 month period. however I still take Milk Thistle daily for liver support! I seem to be on a continuous parasite killing regime which is even more of a reason to give ongoing support.
Herbs come in two different types as far as I am concerned .....those that kill and those that strengthen the body and organs. so whilst you are killing using garlic, P'au Darco etc its really important to take herbs to support function and cleansing of liver , kidneys and lymph system.