Summarized version of a complicated and dumb compound: We all know T3 has fat burning characteristics, the problem is it can carry that effect over into muscle as well. T3 dosed at say, 50-75mcg may be just the right amount necessary to burn the fat. In studies 'normal' doses can improve nitrogen and insulin uptake helping to use them more efficiently, but if you go over that sweet spot you hinder your bodies ability to make efficient use of those same things. So your strength may suffer and muscle loss may occur like it did in animal studies. You're gonna look smaller anyways if your cutting due to the fat loss. This is mild crap that can go wrong easily. Is it that game ending event? No, but you can achieve a lot more with other compounds IMO. Everyone is on this T3 craze as of late... shiny mirrors and polished brass imo.