T3 is catabolic, so you'll want to maybe avoid that one if your goal isn't to lose too much muscle on a cut, and it is absolutely not in any way OTC even if you have the internet... (Looks down at keyboard, lol). I've read up quite a bit on T2 and am not impressed as a stand alone, and am uncertain how effective it is. I avoid some testimonials as being biased, and once removed, it's still an open ticket for me.
The old stand by for many is ECA or ECY if you are ok with Yohimbine.
There are some great supplements which also have ingredients to improve your mood and focus while on a cut.
Remember, however the marketing appears, these things called supplements should have an open label, and they are supplements to a good workout routine; even better diet, and appropriate sleep so you can recover; recoup and continue.