I just bought a bottle of zero carb Isopure (blue raspberry) from GNC the other day. I figured I'd give it a try even though it is like $5 a bottle. I just wanted to taste it. It wasn't cold, room temp it left more of an aftertaste, but it wasn't all bad. It tasted much better after I got it in the fridge for a while. It is weird though, that it's derived from milk (whey) yet the liquid is clear. I'll just stick with Cytogainer which has more protein per serving and even though it's not 100% lactose free, it's 98% and that's good enough for me.