# description
Category of an identified substance associated with allergies or intolerances.

# concept[].definition
Any substance consumed to provide nutritional support for the body.

# concept[].definition
Substances administered to achieve a physiological effect.

# concept[].definition
Any substances that are encountered in the environment, including any substance not already classified as food, medication, or biologic.

# concept[].definition
A preparation that is synthesized from living organisms or their products, especially a human or animal protein, such as a hormone or antitoxin, that is used as a diagnostic, preventive, or therapeutic agent. Examples of biologic medications include: vaccines; allergenic extracts, which are used for both diagnosis and treatment (for example, allergy shots); gene therapies; cellular therapies.  There are other biologic products, such as tissues, which are not typically associated with allergies.