The only time I would advise someone to take both clen and t3 simultaneously would be during the last few weeks of contest prep.

For the average person using both drugs at the same time is overkill.

There is no way in hell clen coupled with a high protein diet will offset the catabolic effect of t3.

The only time you should take t3 is if you have a thyroid issue and it's prescribed by a physician or you're taking a cycle dose of AS.