I suggest you read a book on milk thistle. They are usally about $3.95 on single herbs.
The milk thistle seed is known to influence the liver. In case of mushroom poisoning the milk thistle has saved lives. In CA mexicans pick a certain type of mushroom that in Mexico is safe, but the look alike in CA is deadly and I read once that the milk thistle seed was the ONLY medical way to save their life; if it was not too late, because many of the stories were of ilegal imigrents that would be 90% dead before someone would report the ilness in fear of being deported, so the poisoning would be well advanced.
So I would read about it before I would just "use" it. Christopher Hobbs wrote a great little book on it.
I a planting a few seeds of this weed this year, the farmers will hate me! Thistles spread like wild fire!!!