[Code of Federal Regulations] [Title 21, Volume 5] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR358.310] [Page 312] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 358_MISCELLANEOUS EXTERNAL DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE-- Subpart D_Ingrown Toenail Relief Drug Products Sec. 358.310 Ingrown toenail relief active ingredient. The active ingredient of the product is sodium sulfide 1 percent in a gel vehicle. The gel vehicle is an aqueous, semisolid system with large organic molecules interpenetrated with a liquid.