yeah im not a big chem one fan myself. i definitely wouldn't run t3 without some form of anabolic assistance that's for sure.
Due to the nature of T3, I would be VERY skeptical using ANY research chem site... human grade, pharmaceutical t3 is cheap, and not hard to get your hands on! T3 is something that a LITTLE too much can mean disaster!!!! And some people are just bound to take more(if they are using a RC site for it... thinking it is underdosed) if they aren't seeing the results they think they should.... This type of thing is not good at all, and can make you end up in the hospital!
If you are going to use T3, take the time to get pharma T3(tablets), cytomel is common name for it.... If you can't get pharma grade, I wouldn't use it!
also, with T3 it is IMPERATIVE that you taper off of it!!! you can end up causing thyroid storm if you just stop taking it(this is where your body releases WAY too much Thyroid hormone(t4 and t3), and is very dangerous to your health!)
There is no substitute for diet and cardio, but if you aren't seeing the results you want, or you are prepping for a comp, whatever.. and you need to get to LOW bf%, you will need a fat burner of some sort.... ECA is great for this, and you can add a little T3(as long as you have enough anabolics in your body) to help it along.... I wouldn't go overboard with the thyroid hormones(t3 or t4) simply because you have to depend on your thyroid the rest of your life.. and you really don't want to risk screwing it up!