| Lypressin | 50-57-7 |
| Lysergic Acid Diethylamide | 50-37-3 |
| Lysophosphotidylserine | |
| Macelignan | 107534-93-0 |
| Macimorelin | 381231-18-1 |
| Macozinone | 1377239-83-2 |
| Macrogol Cetostearyl Ether 30 | |
| Macrogol cetostearyl ether 12 | |
| Macrogol poly(vinyl alcohol) grafted copolymer | |
| Macrogolglycerol hydroxystearate | |
| Macrogolglycerol ricinoleate 35 | |
| Madecassic acid | 18449-41-7 |
| Madecassoside | 34540-22-2 |
| Maduramicin | 84878-61-5 |
| Mafosfamide | 88859-04-5 |
| Maftivimab | 2135632-36-7 |
| Magnesium acetate | 142-72-3 |
| Magnesium ascorbate | 15431-40-0 |
| Magnesium aspartate hydrochloride | 28184-71-6 |
| Magnesium gluconate | 59625-89-7 |
| Magnesium glycinate | 14783-68-7 |
| Magnesium levulinate | 58505-81-0 |
| Magnesium malate | 869-06-7 |
| Magnesium peroxide | 14452-57-4 |
| Magnesium phosphate | 7757-87-1 |
| Magnesium silicate | 1343-88-0 |
| Magrolimab | 2169232-81-7 |
| Malachite Green | 10309-95-2 |
| Maleic Acid | 110-16-7 |
| Malic acid | 6915-15-7 |
| Malonaldehyde | 542-78-9 |
| Malonic acid | 141-82-2 |
| Malonyl-CoA | 524-14-1 |
| Maltitol | |
| Maltotetraose | 34612-38-9 |
| Managlinat dialanetil | 280782-97-0 |
| Mandelic acid | 90-64-2 |
| Mangafodipir | 155319-91-8 |
| Manganese citrate | 10060-26-1 |
| Manganese gluconate | 6485-39-8 |