"Ever since I started using Zupreem Avian Maintenence, (I use a blend of the Natural & the Fruit) for ALL my birds: Parakeets, Quakers, Conure, Cockatiels, I have notice a healtier sheen to their plumage, and they are more lively. Before, when I used seeds, my 'keets average life expectancy was only about 3 years or less. Now since using it, I had one live for 5 years, and I have one whos still alive and he's going on 7 years!!! I love it! Before, when I used seeds many would die from "Sour crop" a crop disease where the seeds would rot in their crop (thats the top of the breast that looks full after eatiing). I use the parakeet, cockatiel and parrot/conure blends."