Remeber that t-3 work like a natural hormone in the body. Hormonal processes take time to occour. However takin a does of 100mcg for 15 days should have begun to produce results, even if its only a drop in a few lbs. Personally when I use t-3 I begin on 25mcg for a few day build up to 100mcg a day before tappering off. After only a few days I begin to notice that i'm feeling hotter than usual and sweat bucket loads. I would make sure that it is actually t-3 you're taking. If you're sure just remember that drugs effect people in dfferent ways and keep a regular check on your weight cos their are times when i think i'm puttin weight on and I losin it.