Use a bottle, then take time off equal to usage time...
If your diet is dialed in, and you're doing cardio correctly, this helps push you a bit further and stay the course.
I used this and it worked great for me while trying to stay in a healthy caloric deficit.
Doesn't have the fat burning capabilities of the ECA stack, so it's not even close to a magic pill... And it'll break the bank account too, but far from worthless.
I wouldnt recommend any OTC far burner to anyone who isn't serious about their diet and exercise though. If you're slacking, send me a cashier's check in the amount of OEP and I'll make it my duty to tell you you're progressing nicely!