I wanted to clear up what seems to be a common misconception. Bc a feed is fortified with vitamins and minerals does not equate to it being bad feed. All feed whether its oxbow or manna pro is fortified. Fortified simply means that essential trace minerals and vitamins have been added to the feed. This is why one of the big selling lines for all feeds is "a complete daily ration" or "a complete daily diet" Mazuri is a fortified feed as well. Thats why so many vitamin supplements and trace minerals are always listed in the ingredients list. If someone tells you that you are killing your chin because its fortified they are either misinformed or dont have an understanding of what the word means or the various processes of fortification for feed. You can google the word and find information about the process. The most important things in chin diet are protein and fiber then calcium and phosforus then vitamins then traceminerals. If you can find a feed with stable vitamin c all the better. Hope this helps someone.