I have been using Eternus now for basically a month and definitely can feel the difference. I have been a customer of Neurohacker for some time under the Qualia product. Both products alone are amazing - combining them takes it to a new level. At 55 years of age, I can state without concern that I feel better than I have since I was in my early 40's. I have more focus, energy, and drive since I started taking the products. My recommendation to everyone is to take the leap and try either or bo...Read more.