skip the supplements and stick to whole foods & exercise - primarily cardio - and you'll lose weight. same old formula that's been around for many many years.
if you want to go the shake route to lose some weight get some of the aforementioned whey protein powder and make your own low cal meal replacement drinks using fruits, milled flax seed, water, cinnamon, oats, etc. - many combinations of healthy drinks you can come up with. slim fast and all it's ilk are basically super sweet, artificial goop that have little nutritional value. if you're gonna cut back the calories you must make sure what you DO eat/drink has a lot of real nutrients, not added artificial vitamins and minerals.