Power fat burner: caffeine + blood thinner. That’s most of what things like redline do. Is it going to work if you don’t exercise? Nope, but it sure as hell does help if you are exercising.
I’d really only recommend it to people focused on losing a lot of weight. If you’re trying to lose 10lbs it’ll never make a difference. If you’re trying to lose 100lbs though, then yeah, 6-12 months worth of slightly increased metabolic rate will probs have a net positive affect.