[Code of Federal Regulations] [Title 21, Volume 2] [Revised as of April 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR111.16] [Page 233] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 111_CURRENT GOOD MANUFACTURING PRACTICE IN MANUFACTURING, PACKAGING, LABELING, OR HOLDING OPERATIONS FOR DIETARY SUPPLEMENTS--Table of Contents Subpart C_Physical Plant and Grounds Sec. 111.16 What are the requirements under this subpart C for written procedures? You must establish and follow written procedures for cleaning the physical plant and for pest control.