If you are attempting to gain muscle, I would not use the T3. T3 is responsible for increasing your metabolism and will burn more calories that could be used for muscle gain. It does not specifically target fat, to keep you lean. It just burns "more", period. So it will require you to eat even more to grow. Plus although T3 can be used safely, I wouldn't suggest using a drug in any plan that you don't need. It only increases the chance of side effects and poteinail issues. Prov is fine.