With some Acai products, it is very difficult to be sure of whether it is really working or if it's not but with this Premium Acai, I have found that I started feeling a difference in just the first day and now having been using it for over a month, I have seen noticeable changes take place in my body. So far I have lost 12 pounds that has nearly all been from fat as well as seeing my energy levels spike in the past month. The energy is kind of hard to describe though as it is not the kind of energy spikes you would get from say a cup of coffee or an energy pill. It is more of a solid natural energy. I no longer hit the snooze button for an hour every morning, I wake right up and start my day. I've also noticed that even though I'm very energetic throughout the day, I don't have the slightest bit of trouble getting to sleep at night and I sleep like a rock too.