| Substance | Abbreviation | Systematics | Provings |
| Iberis amara Bitter Candytuft |
Iber | Cruciferae/ Brassicaceae |
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| Ichthyolum Sulphonated Bitumen |
Ichth | Oils and similar Compounds of Carbon |
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| Icosaedron Icosahedron |
Icos | Abstracta |
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| Ictodes foetida/ Pothos foetidus Skunk Cabbage |
Ictod | Araceae |
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| Ignis alcoholis Fire |
Ignis | Physical Radiation or Fields |
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| Ilex aquifolium Holly |
Ilx-a | Aquifoliaceae |
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