- Bio-Mineral Products Co.1
- Boston Drug & Chemical Co., a corporation, Boston, Mass.1
- C. A. Mosso Co.1
- C. U. McClellan Laboratories Corporation1
- Campbell Products, Inc.1
- Carl Fred Krueger, trading as the Oriental Laboratory, St. Louis, Mo.1
- Cecil James Cardwell, trading as Trapper's Remedies, Inc., Weiser, Idaho1
- Charles A. Ainsworth, trading as the Ainsworth Specialty Co., Kansas City, Mo.1
- Charles G. Haskell & Co.1
- City Chemical Corporation1
- City Chemical Corporation, Jersey City, N. J.1
- Cleveland Druggists Specialties Co.1
- Colestin Mineral Water Co.1
- Crescent Sales Co.1
- Curley Distributing Co.1
- Curts-Folse Laboratories1
- Cutter Laboratories1
- Dae Health Laboratories, Inc.1
- Dartell Laboratories1
- Dartell Professional Service1