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1. HCO₃^-, Hydrogencarbonate
2. HDL, High density lipoproteins
3. HEDTA, (2-Hydroxyethyl)ethylenediamine-N,N',N'-triacetic Acid
4. Hemoglobin
5. Heparin
6. Heptanophenone
7. HETE, Hydroxyeicosatetraenoic acid
8. 1,6-Hexandiol, Hexamethylene glycol
9. n-Hexanoic acid
10. 1-Hexanol, n-Hexyl alcohol
11. Hexanophenone
12. Hexobarbital
13. Hexokinase
14. n-Hexyl alcohol, 1-Hexanol
15. Hexyl benzoate
16. 5HIAA, 5-Hydroxyindole-3-acetic acid
17. High density lipoproteins, HDL
18. Hippuric acid
19. Hinokitiol
20. Histamine
21. Histidine, His
22. Ho, Holmium
23. HOCN, Cyanate
24. Holmium, Ho
25. Homatropine
26. Homovanilic acid, HVA
27. HPO₄^2-, Phosphate dibasic
28. H₂PO₂^-, HPO₂^2-, Hypophosphite
29. H₂PO₃^-, HPO₃^2-, Phosphite
30. H₂PO₄^-, Phosphate monobasic
31. H₃PO₄^-, Phosphoric acid
32. HS^-, Hydrogen sulfide
33. 5HT, Serotonin, 5-Hydroxytryptamine
34. Human γ-globulin
35. HVA, Homovanilic acid
36. Hyaluronic acid
37. Hydracrylic acid, β-Hydroxypropionic acid
38. Hydrochloric acid, HCl
39. Hydrochlorothiazide
40. Hydrocortisone
41. Hydrogencarbonate, HCO₃^-
42. Hydrogen peroxide
43. Hydrogen sulfide, HS^-
44. Hydrolyzed dextran
45. Hydroquinone
46. Hydroxybenzo[a]pyrene
47. p-Hydroxybenzoate
48. Hydroxybenzoic acid
49. 3-Hydroxycarbofuran
50. Hydroxyeicosatetraenoic acid, HETE
51. Hydroxyethyl cellulose
52. Hydroxyethylene-1,1-diphosphonate, HDEPO
53. (2-Hydroxyethyl)ethylenediamine-N,N',N'-triacetic Acid, HEDTA
54. Hydroxyethyl glucose
55. α-Hydroxygltaric acid
56. 5-Hydroxyindole-3-acetic acid, 5HIAA
57. 2-Hydroxyisobutyric acid
58. 5-(Hydroxymethyl)furfural, 5-HMF
59. 2-(4-Hydroxyphenoxy)propionic acid
60. β-Hydroxypropionic acid, Hydracrylic acid
61. 7α-Hydroxyriboflavin
62. 5-Hydroxytryptamine, Serotonine, 5HT
63. Hydantoin
64. Hypophosphite monobasic, H₂PO₂^-
65. Hypoxanthine