### Question
How does the law define supplement?


### Answer
Under *21 U.S.C. § 379j*, **supplement** is defined as:

> a request to the Secretary to approve a change in a biosimilar biological product application which has been approved, including a supplement requesting that the Secretary determine that the biosimilar biological product meets the standards for interchangeability described in section 262(k)(4) of title 42

#### Citation:
  - *21 U.S.C. § 379j*
  - Heading: **CHAPTER 9-FEDERAL FOOD, DRUG, AND COSMETIC ACT > SUBCHAPTER VII-GENERAL AUTHORITY > Part C-Fees > subpart 8-fees relating to biosimilar biological products**

