Hey, good to hear from you! :)
It IS possible to re-build liver function. The most important herb for that is Milk Thistle, but there are others.
Here's a link to all my notes, one of which is all about the liver. I highly recommend Planetary Formula's Bupleurum Liver Cleanse, as it is a nicely well-rounded complex including dandelion to encourage the liver to produce more bile, which is very important to restoring the liver's ability.
Some people like Dr. Cabot's liver detox supplement, but I find that the ingredients are great for detoxing but not totally for rebuilding, but still, it might be good for you. She's the one who has the www.liverdoctor.com page, an excellent reference.
And of course there's Julia Chang's products, Chinese Bitters and Coptis, but they're more expensive.