True, milk thistle is good to protect the liver.  But petrochems damage other organs as well, kidneys, brain, lungs, etc.  Basically they are toxic to every cell in the body.

From what I've seen, it's only a few bucks more for pure d-limo, but that may not be synthetic now that I think aboot it... Swim's got some "high purity" limo on the way, I'll report back when I hear how his evap test goes.