I have been running 25mcg tab of T4 with my HGH for about 2 months now. Turns out I cannot get T4 any longer. I have enough T3 to get me through the rest of my cycle.

Question: Is it ok/safe for me to switch directly to T3 from T4 back to back? What is the major difference between T3 & T4. My source told me T3 is better because it's stronger. I have read T4 is safer than T3. The T4 is producing good results already.

Thanks for the help.