I noticed a difference the very first day that I drank Vitalized water. I definitely had more energy. In fact, during the year that I have been drinking this water, I have been reminded on several occasions, just how much of a difference the water makes for me. On several occasions, I have not had Vitalized water available and if I go for more than a couple of days, I can certainly tell the difference! My energy level takes a dive – but always picks up when I begin drinking the water again.