| Code | Display | Definition |
| allergen | Allergen | A substance that causes an allergic reaction. |
| biological | Biological Substance | A substance that is produced by or extracted from a biological source. |
| body | Body Substance | A substance that comes directly from a human or an animal (e.g. blood, urine, feces, tears, etc.). |
| chemical | Chemical | Any organic or inorganic substance of a particular molecular identity, including -- (i) any combination of such substances occurring in whole or in part as a result of a chemical reaction or occurring in nature and (ii) any element or uncombined radical (http://www.epa.gov/opptintr/import-export/pubs/importguide.pdf). |
| food | Dietary Substance | A food, dietary ingredient, or dietary supplement for human or animal. |
| drug | Drug or Medicament | A substance intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or other animals (Federal Food Drug and Cosmetic Act). |
| material | Material | A finished product which is not normally ingested, absorbed or injected (e.g. steel, iron, wood, plastic and paper). |