This works well, I have lost about 1 kg in the 5 days since I started, but it is insanely sweet and makes me feel ill when I drink it. (Medusa's Pine Lime)
I have taken to putting it in a little bit of yoghurt, or even just mixing it with a tbsp of water, then downing it like a shot, followed by some water. Might have to try some of the other flavours, to find one that isn't as sweet.