| Human type V collagen | K8J6GZ36BG | protein |
| Humanin | H975EUX36G | chemical |
| Humanized bispecific antibody neutralizing both sclerostin and Dickkopf-1 (AGA-2115) | NUE24Q59X2 | protein |
| Hungatella effluvii | J4VGA4A5F6 | structurallyDiverse |
| Hungatella hathewayi | 2PEE4EF92R | structurallyDiverse |
| Hungatella hathewayi VE202-04 16S rRNA gene sequence | 4P5VY74EP5 | nucleicAcid |
| Hungatella hathewayi strain VE202-04 | 7TPJ9BU3D2 | structurallyDiverse |
| Huperzine B, (+)- | LW8ZHH7Z3V | chemical |
| Huperzine B, (-)- | DC3Z5425Y5 | chemical |
| Huratoxin | GXV3CR7BC8 | chemical |
| Hyaluronic Acid Crosspolymer-1 | UBB595QH39 | polymer |
| Hyaluronic Acid Crosspolymer-2 | NVH5B2HJ8P | polymer |
| Hyaluronic Acid Crosspolymer-3 | KHL6H75A94 | polymer |
| Hyaluronic Acid Crosspolymer-4 | VN9Y4R8787 | polymer |
| Hyaluronic Acid Crosspolymer-5 | CA6S4N8YUB | polymer |
| Hyaluronic acid Crosspolymer-8 | 6NLJ325PTP | polymer |
| Hyaluronic acid crosspolymer-6 | WDC6AXF3WC | polymer |
| Hyaluronic acid crosspolymer-7 | UWL9H9F7TP | polymer |
| Hyaluronidase (Human Recombinant) | 743QUY4VD8 | protein |
| Hydnocarpus calvipetalus seed oil | DN83W848KB | structurallyDiverse |
| Hydnocarpus calvipetalus whole | 34Q85J2LZF | structurallyDiverse |
| Hydnocarpus castaneus whole | LA5XH5E805 | structurallyDiverse |
| Hydnocarpus hainanensis whole | EKX76Y52HU | structurallyDiverse |
| Hydnocarpus pentandrus seed oil | 4FC699C375 | structurallyDiverse |
| Hydnocarpus pentandrus whole | 4C36DZH81R | structurallyDiverse |
| Hydralazine hydrochloride | FD171B778Y | chemical |
| Hydramethylnon | J265GZ7MFJ | chemical |
| Hydrangea chinensis whole | 4EN4UPV5G8 | structurallyDiverse |
| Hydrazine | 27RFH0GB4R | chemical |
| Hydrazine hydrate | KYD297831P | chemical |
| Hydrazine, (2-chloro-4,6-dimethylphenyl)-, hydrochloride | J224YF6YW4 | chemical |
| Hydrazinoacetic acid | NP52UM3ECS | chemical |
| Hydrazyl, 2-(3-methoxyphenyl)-1-sulfo-, monosodium salt | MM7CBP7YZV | chemical |
| Hydrobromic acid | 3IY7CNP8XJ | chemical |
| Hydrochloric acid | QTT17582CB | chemical |
| Hydrochlorothiazide | 0J48LPH2TH | chemical |
| Hydrochlorothiazide dimer | 22J416Y79C | chemical |
| Hydrocinnamic acid, m-[bis(2-fluoroethyl)amino]- | LJJ49T6U2V | chemical |
| Hydrocinnamic acid, p-[bis(2-fluoroethyl)amino]- | LN6RZ8HHZ9 | chemical |
| Hydrocodone N-Oxide | 7KS6J7N3NS | chemical |
| Hydrocortisone | WI4X0X7BPJ | chemical |
| Hydrocortisone 21-aldehyde | XT2H26EPI2 | chemical |
| Hydrocortisone Acetate | 3X7931PO74 | chemical |
| Hydrocortisone dimer | BY4US3P6VS | chemical |
| Hydrocortisone hemisuccinate | LIU00Z1Z84 | chemical |
| Hydrocortisone hemisuccinate anhydrous | IHV1VP592V | chemical |
| Hydrogen | 7YNJ3PO35Z | chemical |
| Hydrogen cyanide | 2WTB3V159F | chemical |
| Hydrogen peroxide | BBX060AN9V | chemical |
| Hydrogenated C12-18 Mono- and Diglycerides | 82TZ9D9546 | mixture |