I cannot tolerate any amount of clen while I'm on T3. I'm running T3 for the first time right now, and have tried 2 different brands of clen on 4 different occasions, and I get the same results: headaches, shakes, racing heart, anxiety, tiredness, and naseau. I have tried dosages from 40mcgs to 10mcgs and nothing is right. Meanwhile, with just the T3 and a great diet and some tren and test, I have lost 8lbs of solid fat with only some strength loss in squats and dl's. Everything else is up. I'm getting ripped and I still have a week and a half of T3 at 100mcg's. I will taper down and then try clen again, but I don't think I'll order anymore in the future. T3 is soooo much better and easier.