---
kind: "section"
citation: "21 C.F.R. § 573.225"
title: "21"
number: "573.225"
heading: "1,3-Butylene glycol."
url: "https://uscodex.org/cfr/21/573.225"
---

# §573.225. 1,3-Butylene glycol.


The food additive 1,3-butylene glycol (1,3-butanediol) may be safely used in accordance with the following prescribed conditions:

- (a) It complies with the specifications in [§ 173.220(a)](/cfr/21/173.220.md?p=a) of this chapter.
- (b) **It is intended for use in swine feed as a source of energy.**
- (c) It is to be thoroughly mixed into feed at levels not to exceed 9 percent of the dry matter of the total ration.
- (d) 1,3-Butylene glycol should be mixed in feed with equipment adapted for the addition of liquids, and the feed should be mixed not less than 5 minutes after its addition.

## Notes

### Amendments

[53 FR 40061, Oct. 13, 1988]

### Authority

Authority: 21 U.S.C. 321, 342, 348.

### Source

Source: 41 FR 38652, Sept. 10, 1976, unless otherwise noted.

### Amendments

[53 FR 40061, Oct. 13, 1988]