---
kind: "section"
citation: "21 C.F.R. § 556.428"
title: "21"
number: "556.428"
heading: "Narasin."
url: "https://uscodex.org/cfr/21/556.428"
---

# §556.428. Narasin.

- (a) **Acceptable daily intake (ADI).** The ADI for total residue of narasin is 5 µg/kg of body weight per day.
- (b) **Tolerances.** The tolerance for narasin (marker residue) is:
  - (1) **Chickens.** Abdominal fat (target tissue): 480 ppb.
  - (2) [Reserved]
- (c) **Related conditions of use.** See §§ [558.363](/cfr/21/558.363.md) and [558.364](/cfr/21/558.364.md) of this chapter.

## Notes

### Authority

Authority: 21 U.S.C. 342, 360b, 371.

### Source

Source: 84 FR 32993, July 11, 2019, unless otherwise noted.