||biologically active substance
A Substance that is capable of inducing a change in the structure or functioning of an Organism. This Class includes Substances used in the treatment, diagnosis, prevention or analysis of normal and abnormal body function. This Class also includes Substances that occur naturally in the body and are administered therapeutically. Finally, BiologicallyActiveSubstance includes Nutrients, most drugs of abuse, and agents that require special handling because of their toxicity.