---
kind: "section"
citation: "21 C.F.R. § 333.320"
title: "21"
number: "333.320"
heading: "Permitted combinations of active ingredients."
url: "https://uscodex.org/cfr/21/333.320"
---

# §333.320. Permitted combinations of active ingredients.

- (a) Resorcinol identified in [§ 333.310(b)](/cfr/21/333.310.md?p=b) may be combined with sulfur identified in [§ 333.310(f)](/cfr/21/333.310.md?p=f).
- (b) Resorcinol monoacetate identified in [§ 333.310(c)](/cfr/21/333.310.md?p=c) may be combined with sulfur identified in [§ 333.310(f)](/cfr/21/333.310.md?p=f).

## Notes

### Amendments

[75 FR 9776, Mar. 4, 2010]

### Source

Source: 56 FR 41019, Aug. 16, 1991, unless otherwise noted.

### Authority

Authority: 21 U.S.C. 321, 351, 352, 353, 355, 360, 371.

### Source

Source: 52 FR 47322, Dec. 11, 1987, unless otherwise noted.

### Amendments

[75 FR 9776, Mar. 4, 2010]