| Magnesium DL-Aspartate Tetrahydrate | 2068-80-6 | | 1 |
| Magnesium Glycerophosphate | | | 1 |
| Magnesium Monoethyl Fumarate | 83918-60-9 | Magnesium Salts | 1 |
| Magnesium Oxide Heavy | 1309-48-4 | | 1 |
| Magnesium fluoride | 16674-78-5 | Magnesium Salts | 1 |
| Magnesium gluconate | 59625-89-7 | Electrolytes | 1 |
| Magnesium glycinate | 14783-68-7 | Other substances | 1 |
| Magnesium salicylate | 18917-89-0 | | 1 |
| Mal-(Ch2)5-Val-Cit-Pab-Eribulin | 2130869-21-3 | | 1 |
| Mal-Di-Eg-Opfp | | | 1 |
| Mal-Ha-Osu | | | 1 |
| Mal-PEG2-Val-Cit-PAB-OH | 2055041-38-6 | | 1 |
| Mal-Peg2-Gly-Gly-Phe-Gly-Exatecan | 1599439-54-9 | | 1 |
| Mal-Peg2-Vcp-Eribulin | 2130869-18-8 | | 1 |
| Mal-Peg8-Amide-Val-Ala-(4-Nh2)-Exatecan | 2495742-34-0 | | 1 |
| Mal-Tetra-Eg-Opfp | | | 1 |
| Mal-Tri-Eg-Opfp | | | 1 |
| Maltitol | | | 1 |
| Maltose | 69-79-4 | Indifferent resources | 1 |
| Mandelic acid | 90-64-2 | Anti-infective Agents | 1 |
| Manganese carbonate | 598-62-9 | Means in metabolic disorders | 1 |
| Manganese(II) chloride tetrahydrate | 13446-34-9 | | 1 |
| Manganese(II) sulfate monohydrate | 10034-96-5 | | 1 |
| Manna | | Laxatives | 1 |
| Marian thistle | | Herbal remedies | 1 |
| Maribavir | 1599432-33-6 | Antivirals | 1 |
| Marigold flower | | Herbal remedies | 1 |
| Maropitant citrate hydrate | 359875-09-5 | | 1 |
| Mate leaf | | Herbal remedies | 1 |
| Matricaria | | Herbal remedies | 1 |
| Matuzumab | 339186-68-4 | | 1 |
| Maytansinoid DM3 | 796073-54-6 | | 1 |
| Maytansinoid DM4 | 796073-69-3 | | 1 |
| Mc-Ggfg-Exatecan | 1600418-29-8 | | 1 |
| Mc-Ggfg-Pab-Oh | 2632342-05-1 | | 1 |
| Mc-Gly-Gly-Phe-Gly | 2413428-36-9 | | 1 |
| Mc-Gly-Gly-Phe-Gly-Cyclobutanecarboxylic-Exatecan | 2414393-22-7 | | 1 |
| Mc-Gly-Gly-Phe-Gly-Nh-Ch2-O-Ch2Cooh | 1599440-25-1 | | 1 |
| Mc-Mmae | 863971-24-8 | | 1 |
| Mc-Va-Pab-Exatecan | 2680543-57-9 | | 1 |