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 E—Emulsifying Agents (§582.4101 to §582.4666) > 582.4666—Propylene glycol.