The longest I've been on MuscleMilk was for about 2 months. The shake is very thick and creamy-ish. It has a lot of fat in it. Don't use Muscle Milk if you want to have the cut body. At times, I felt like my head was going to explode after every flight of stairs I walked up. But they have MuscleMilk light now, which is a lot healthier. It's your call. Other than that, it's a good supplement.