Haven't heard much about guggul in a long long while. Have you tried guggul before? Everyone including myself that I have seen try it, has had problems with it enlarging their prostate while on it. If you are already on t3, guggul is going to do you no good. You are already replacing the main hormone that your thyroid secretes, t3, with synthetic t3.
Ag guys T3 is good to go. Good stuff.
edit: I should mention that it may still give you the acne clearing benefits of course.