| Red poppy | | Herbal remedies | 1 |
| Red sorrel flower | | Herbal remedies | 1 |
| Remdesivir Intermediates | | | 1 |
| Resmetirom Intermediates | | | 1 |
| Rezafungin | 179324-69-7 | Antifungals | 1 |
| Rhamnus bark powder | | Herbal remedies | 1 |
| Rhei rhapontici radix | | Herbal remedies | 1 |
| Rhodiola rosea extract | | | 1 |
| Rhubarb root | | Herbal remedies | 1 |
| Ribociclib intermediates | 1211443-58-1 | | 1 |
| Riboflavin-5-phosphate Sodium | 2319-84-8 | | 1 |
| Ribostamycin | 25546-65-0 | | 1 |
| Ricine racine juice | | Herbal remedies | 1 |
| Ripretinib | 170729-80-3 | Protein kinase inhibitors | 1 |
| Risedronate sodium | 118-55-8 | Bisphosphonates | 1 |
| Rivastigmine Tartrate | 129101-54-8 | | 1 |
| Robenacoxib | 220991-32-2 | Other anti-inflammatory agents | 1 |
| Rochelle salt | 6381-59-5 | | 1 |
| Rofecoxib | 162011-90-7 | NSAIDs | 1 |
| Rolipram | 61413-54-5 | Phosphodiesterase-4 Inhibitors | 1 |
| Roman chamomile | | Herbal remedies | 1 |
| Romiplostim | 267639-76-9 | Other antithrombin | 1 |
| Ropivacaine Intermediates | | | 1 |
| Rosemary leaf | | Herbal remedies | 1 |
| Rotenone | 1228105-51-8 | | 1 |
| Rotigotine intermediates | 58349-17-0 | | 1 |
| Roxadustat intermediates | 808116-52-1 | | 1 |
| Rucaparib | 283173-50-2 | Enzyme Replacements/modifiers | 1 |
| S-Carboxymethylcysteine-L-Lysinate | 49673-81-6 | Mucolytics | 1 |
| S-ethylisothiourea hydrobromide | 1071-37-0 | | 1 |
| Saccharum | | Oral care products | 1 |
| Sacubitril valsartan | 936623-90-4 | | 1 |
| Saffron Extract | 161715-24-8 | | 1 |
| Saffron thread cut | | Herbal remedies | 1 |
| Safinamide methanesulfonate | 946075-13-4 | Other central nervous system agents | 1 |
| Sage | | Herbal remedies | 1 |
| Salvia tincture | | Herbal remedies | 1 |
| Sarafloxacin | 98105-99-8 | Fluorides | 1 |
| Sarolaner | 1398609-39-6 | | 1 |
| recombinant Human Albumin | 11061-68-0 | | 1 |