the only steroid that has rock hard studies showing they enhance weight loss is anavar. it has to do with the way it is structured just the right way and the effects on metabolism.
other guys have sworn they have cut hard on tren even while eating a crappy diet, i've seen this in person and from their logs. however no doubt those people gained it all back once they came off tren. one of those things where you get a boomerang effect. i've never cut on tren at all. just gotten huge and strong on it.
the nice thing about cutting with primo in my experience is you won't get those carb cravings or other side effects you will get on most all other anabolic steroids. that is the whole purpose of anabolics, to make you hungry to eat to fight muscle wasting. well primo even at higher dosages doesn't do that. so its a good one to take if you want to cut down for that reason