A lot of stimulants are loaded with fillers and too much caffeine in an attempt to hide the fact they have nothing in them that you should be taking or that is really effective to help with weight loss. The best thing to do is get your diet much more consistent and dialed in and then start getting your cardio training on point
I would utilize sarms and peptides to help as well, but remember, no matter what you are using, your diet is going to be the biggest part of this followed by your training