ECA works, tried and true there
Tried yes true ...I'll have to disagree...there is a lot of things that I personally dislike with this "drugged" type of weight loss.
1) Way too much appetite suppression. Yah appetite suppression is a crappy way to diet, lack of eating puts you in a catabolic state, I much prefer being anabolic while cutting. Your appetite tells you when to eat and how much. Appetite is valuable weight loss tool. Cravings may be another matter, as you may be tempted to eat the wrong type of food. I would rather replace discipline with appetite suppression.
2) Ephedrine is freaking harsh on stim sensitive people. I almost needed to be hospitalized the only time I took it ... my heart was racing and I was all shaky. I don't like feeling I am on crack.
3) Metabolism is prone to slow down too much... usually from the lack of proper nutrition.
Modern cutting or recomping depends more on maintaining/gaining mass and using your metabolism by eating intellegently. Use a diet plan and supplementation that is aimed at retaining muscle mass. This may mean you don't lose as fast but unless your behind on a contest prep what's your hurry. You will look a lot better in the long run if you stay large. There are lots of good products for fat loss... I myself avoid products that are aimed at appetite suppression and stimulation.