| Cannabidivarin | 24274-48-4 |
| Capric triglyceride | 123465-33-8 |
| Caprylic acid | 124-07-2 |
| Carbachol | 51-83-2 |
| Carvedilol phosphate hemihydrate | 851220-85-4 |
| Castor oil hydrogenated | |
| Cefamandole | 34444-01-4 |
| Cefmenoxime | 65085-01-0 |
| Cetuximab | 205923-56-4 |
| Chloramphenicol Succinate | 3544-94-3 |
| Chloramphenicol palmitate | 530-43-8 |
| Chlorcyclizine | 82-93-9 |
| Chlorine | 7782-50-5 |
| Chlorobutanol Hemihydrate | 6001-64-5 |
| Chloroprocaine | 133-16-4 |
| Cilengitide | 188968-51-6 |
| Cinacalcet Hydrochloride | 364782-34-3 |
| Cisatracurium besylate intermediates | 5884-22-0 |
| Citric Acid Monohydrous | 5949-29-1 |
| Clevidipine | 167221-71-8 |
| Clofedanol | 791-35-5 |
| Clonixin | 17737-65-4 |
| Cloperastine | 3703-76-2 |
| Clotiazepam | 33671-46-4 |
| Cobimetinib | 934660-93-2 |
| Colestipol | 26658-42-4 |
| Copper | 15158-11-9 |
| Copper (II) sulfate anhydrous | 7758-98-7 |
| Copper (II) sulfate pentahydrate | 7758-99-8 |
| Corticotropin | 12427-33-7 |
| Creatine | 57-00-1 |
| Creatine monohydrate | 6020-87-7 |
| Cromoglicate Sodium | 15826-37-6 |
| Cyclofenil | 2624-43-3 |
| Cysteamine | 60-23-1 |
| Cysteine hydrochloride | |
| Cytidine Diphosphate Trisodium | 203787-91-1 |
| D-Phenylalanine | 673-06-3 |
| D-Serine | 312-84-5 |
| Dactinomycin | 50-76-0 |