I've bought this 3 times now and am about to make a new order! My kitty has asthma, is aging, and recently had a really bad reaction to cheap flea medication a few months back and I thought I might loose her, she lost some hair, lost 5 lbs, and didnt want to be near me anymore. I spend 100s on NMN & NRC for myself and went searching for someone who puts enough care into their products as the one I buy for myself and wound up here! Every time I start her on this she is years younger after even 3 days even after her health scare. She put back on 5 lbs to a healthy weight, her eyes are shiny, her coat is beautiful! 100% believe in this product! Unfortunately she doesnt like eating it but I mix in 15ml warm water and give it to her with her other oral medications every other day. I do have another cat that licks the bowl clean so I think its just my girl being picky. This is something I would take myself and I feel good about the quality and results I see! As you can see she's right back next to me and healthy as can be!