Waste of money in my opinion... that especially but T3, which is supposedly much more potent, is bullshit too. By some Xenadrine--works just as well or better.
T-4 is much weaker than T-3. What are you planning on using it for? Are you trying to cut or help aid protein synthesis? And Muscleup is right about running AS with it, whatever your goal is.
i was going to use it with my cutting cycle , show time 13 weeks am doing 6 weeks sust dball and 6 weeks clen parabolin stan equipoise but what i read and have talked to others ill give it a miss ..