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1. La, Lanthanum
2. Lactate dehydrogenase
3. Lactic acid
4. Lactitol
5. γ-Lactoalbumin
6. Lactoglobulin
7. Lactosylfructoside
8. Lactose
9. Lactulose
10. Lansoprazole
11. Lanthanum, La
12. Laudanosoline
13. Lauric acid
14. Lauryl stearyl thiodipropionate
15. LDL, Low density lipoproteins
16. Lead, Pb²⁺
17. Lecithin from soybean
18. Lectin
19. Leucine
20. Leu-enkephalin
21. Leu-enkephalin-Arg
22. Leu-enkephalin-NH₂
23. Leu-Trp-Met
24. Leukotriene, LT
25. Levulinic acid
26. Li⁺, Lithium
27. Lidocaine
28. Licorice
29. Lignin
30. Lignosulfonic acid sodium salt
31. Linoleic acid
32. Linolenic acid
33. Lipoprotein
34. High density lipoproteins, HDL
35. Very low density lipoproteins, VLDL
36. Lipoxidase
37. Liquid for permanent wave
38. Liquid paraffin
39. Lithium, Li⁺
40. Lorazepam
41. Low density lipoproteins, LDL
42. LT, Leukotriene
43. Lu, Lutetium
44. Lumiflavin
45. Lutetium, Lu
46. Lysine, Lys
47. Lysozyme
48. Lysozyme chloride