I've been on the British T3 since July this year. Since then I have been fighting one infection after another constantly. It seems that my immune system is back to what it was when I was on T4 only. Subsequent to taking the British T3, I had taken the Mexican T3 for several months, and my immune system was doing much better on it, and I stayed infection free for nearly a year. As well as the infections that I am fighting, some of the other horrible symptoms have returned, such as the burning sensation in the soles of my feet, and being wracked by muscular pain. I am just wondering whether it is a coincidence, or if the British T3 I am getting from the NHS is really weak, and if I should ditch it and go back to buying my own from abroad. I would be interested to hear if anyone else has experienced similar or not from the British T3.