---
kind: "section"
citation: "21 C.F.R. § 358.720"
title: "21"
number: "358.720"
heading: "Permitted combinations of active ingredients."
url: "https://uscodex.org/cfr/21/358.720"
---

# §358.720. Permitted combinations of active ingredients.

- (a) **Combination of active ingredients for the control of dandruff.** Salicylic acid identified in [§ 358.710(a)(4)](/cfr/21/358.710.md?p=a-4) may be combined with sulfur identified in [§ 358.710(a)(7)](/cfr/21/358.710.md?p=a-7) provided each ingredient is present within the established concentration and the product is labeled according to [§ 358.750](/cfr/21/358.750.md).
- (b) **Combination of control of dandruff and external analgesic active ingredients.** Coal tar identified in [§ 358.710(a)(1)](/cfr/21/358.710.md?p=a-1) may be used at a concentration of 1.8 percent coal tar solution, on a weight to volume basis, in combination with menthol, 1.5 percent, in a shampoo formulation provided the product is labeled according to [§ 358.760](/cfr/21/358.760.md).

## Notes

### Amendments

[72 FR 9852, Mar. 6, 2007]

### Source

Source: 56 FR 63568, Dec. 4, 1991, unless otherwise noted.

### Authority

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

### Source

Source: 55 FR 33255, Aug. 14, 1990, unless otherwise noted.

### Amendments

[72 FR 9852, Mar. 6, 2007]