This is my 3rd purchase and let me tell you, I am 62 years old and I feel better now than I have for the past couple years. I was always very active, but recently gained some weight due to feet and knee issues, therefore I was always tired. If I did get the energy to go to the gym, I would be done for the day. Now I can go to the gym and still come home and do things around the house. Maybe it's my imagination, maybe not, but as long as I keep feeling this good, I don't care! I am only taking 2 ...