| CDP-Choline | | | 1 |
| Calcium Monoethyl Fumarate | 62008-22-4 | Calcium regulators | 1 |
| Calcium Sennosides | | | 1 |
| Calcium silicate | 1344-95-2 | Gastrointestinal Agents | 1 |
| Calcium threonate | 70753-61-6 | Antimetabolites | 1 |
| Calendula flower | | Herbal remedies | 1 |
| Californian poppy herb | | Herbal remedies | 1 |
| Camomile fluid extract | | Herbal remedies | 1 |
| Camostat | 59721-28-7 | Enzyme Replacements/modifiers | 1 |
| Camphor tree natural | | Herbal remedies | 1 |
| Camporated opium tincture | | | 1 |
| Cannabichromene | 20675-51-8 | Herbal remedies | 1 |
| Cannabidivarin | 24274-48-4 | Herbal remedies | 1 |
| Cannabigerol | 25654-31-3 | Herbal remedies | 1 |
| Cannabinol | 521-35-7 | Herbal remedies | 1 |
| Canotis Arachnoidea Extract | 389139-89-3 | | 1 |
| Cantharidin | 56-25-7 | Anticancer drugs | 1 |
| Canthaxanthin | 514-78-3 | | 1 |
| Cape aloe | | Herbal remedies | 1 |
| Capivasertib | 1143532-39-1 | Other substances | 1 |
| Capmatinib | 1029712-80-8 | Enzyme Replacements/modifiers | 1 |
| Caraway seed | | Herbal remedies | 1 |
| Carbasalate Calcium | 5593-20-4 | | 1 |
| Carboxymethylcellulose | 9000-11-7 | Emollients and protectives | 1 |
| Cardamom fruit | | Herbal remedies | 1 |
| Cardamon compound | | | 1 |
| Cariprazine Hydrochloride | 1083076-69-0 | | 1 |
| Carphedon (Phenylpiracetam) | 1211441-98-3 | | 1 |
| Carrot seed | | Diuretics | 1 |
| Cascara liquid extract | | | 1 |
| Castanospermine | 79831-76-8 | Indifferent resources | 1 |
| Cefalonium | 5575-21-3 | Other substances | 1 |
| Cefamandole nafate | 57268-80-1 | Anti-infective Agents | 1 |
| Cefixime Trihydrate | 79350-37-1 | | 1 |
| Cefodizime | 69739-16-8 | Cephalosporins | 1 |
| Cefonicid | 61270-58-4 | Cephalosporins | 1 |
| Cefoperazone / Sulbactam (2:1) | 115550-35-1 | | 1 |
| Cefoperazone sodium and Sulbactam sodium | 69388-84-7 | | 1 |
| Cefovecin Sodium | 84957-29-9 | | 1 |
| Cefpiramide | 70797-11-4 | Cephalosporins | 1 |