I've been taking Urolithin A for several months now and I can honestly say it is one of the few products I have ever taken that I notice an impact. I don't generally have much pain or physical discomfort, but I have noticed a decrease in energy levels as I've gotten older, especially in the afternoon and early evening. But I have noticeably more energy throughout the day since I started taking Urolithin A with NAD+ Booster. No more afternoon naps needed. And I've seen a marked improvement in my metabolic age. I'm 59 and since taking the supplement, my metabolic age has dropped to 48 years old and holding. I've lost about 5 lbs of fat without changing my diet or increasing my exercise routine. I'm very pleased and am looking forward to seeing where I am after 6 months of using the product.