| Substance | Abbreviation | Systematics | Provings |
| Tabacum fumatum smoked cigarette |
Tab-fum | Solanaceae |
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| Tabernanthe iboga Iboga |
Ibog | Apocynaceae |
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| Talauma mexicana |
Tal-m | Magnoliaceae |
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| Talinum paniculatum |
Tali-p | Talinaceae |
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| Talpa europaea / Pel talpae European Mole |
Talpa | Talpidae |
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| Tamus communis Black Bryonia |
Tam | Dioscoreaceae |
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| Tanacetum vulgare Tansy |
Tanac | Asteraceae/ Compositae |
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| Tanghinia venenifera |
Tang | Apocynaceae |
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| Tannicum acidum Tannic Acid |
Tann-ac | Aromatic Carbon Compounds |
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| Tantalum metallicum Tantal |
Tant | Tantalum |
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| Taosca Aqua water from the seven streams of Taosca |
Taos-aq | Aquae mineraliae |
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