1000mg of Milk Thristle Seed Extract--standardized for at least 80% SILYMARIN.
I would also reccomend a GREAT liver support suuplement called "LIV52". It is the GOOD STUFF--clinically demonstrated to be 3 times as effective as Milk Thristle in correcting elevated liver values. Furthermore, it protects agains other toxins and chemicals, while milk thrisle primarily helps with organic toxins.