CFR > Title 21 - Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER E—ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS (parts 500 to 590) > PART 582—SUBSTANCES GENERALLY RECOGNIZED AS SAFE > SUBPART F—Nutrients and/or Dietary Supplements 1 (§582.5013 to §582.5997) > 582.5223—Calcium pyrophosphate.