Clen helps my breathing, but it is not meant for everyone, since the sides can be harsh for some. If you get good clen or albut, you will be jittery as hell the first few days, even on a low dose. Many people find those sides to be so uncomfortable, that they stop using the drug, and never touch it again. I start to feel better after the first few days. For fat-loss I like to take T3+T4 for 3 week,s and then take Clen for 3 weeks, and repeat. It works good if you eat enough clean calories, so you don't lose muscle and increase the cardio. The best way to make changes to your body is to change your diet, change your excersize routine, and take supplements that can assist you. Lifestyle changes need to be made to meet your goals, I never understood why people work so hard to lose weight, only to revert back to there old habits and gain the weight back..