Also just to pursue the question of what is the goal of taking t3 -- if for "fat loss" I'd really recommend exploring optimizing diet, cardio & training first. Not to steer you from goign into the t3 use, but simply because you are trying to do a hormone manipulation for something that can be achieved much more accurately and maintainably w/ diet & training -- those are the basis for anything & any supps taken for 'fat loss' are only going to work as supplements if the diet & training aren't already achieving the goals you are after.