If you can stay on a strict regimen you will lose weight on Isagenix. You basically drink two "shakes" plus one very low calorie meal, each day for 5 days then for 2 days you ingest liquid products plus water only. By the end of those two days, I was ravenous but managed to lose weight until I became bored with it.
It is very expensive. I could tolerate the liquids if I held my nose while chugging it down. I forget the name of one of them but it tasted like prune juice only not as good as prune juice. Check the sugar content in the shake ingredients, its surprisingly high.
Sorry that I can't recount the details, it's been several years.
There's a little pressure to sell which feeds their pyramid structure but is easily ignored if you simply want to be a consumer.
ETA: The shakes don't taste bad at all. Just the other stuff. They also offer bars and other snack items to help through rough spots.