I took superclen for the first time yesterday before I worked out. I took 1/4 of a tab and after about 45 minutes was feeling still the same. But, when I got about half way into my workout I started to notice it. I was sweating a lot more than normal and I felt sort of tired. It did increase my apetite yesterday so it seems like it's working. The only problem that I sort of scared about is that I've only had 3 noseblleds my whole life and I had a bad one this morning it was gushing out. I don't know if the clen did this anyone else have an idea. I don't know if I want to take anymore untill I find out what the deal is.