21 CFR § 347.12 - Astringent active ingredients.

---
identifier: "/us/cfr/t21/s347.12"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 347.12 - Astringent active ingredients."
title_number: 21
title_name: "Food and Drugs"
section_number: "347.12"
section_name: "Astringent active ingredients."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "D"
subchapter_name: "DRUGS FOR HUMAN USE"
part_number: "347"
part_name: "SKIN PROTECTANT DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 321, 351, 352, 353, 355, 360, 371."
regulatory_source: "58 FR 54462, Oct. 21, 1993, unless otherwise noted."
cfr_part: "347"
---


# 347.12 Astringent active ingredients.

The active ingredient of the product consists of any one of the following within the specified concentration established for each ingredient:

(a) Aluminum acetate, 0.13 to 0.5 percent (depending on the formulation and concentration of the marketed product, the manufacturer must provide adequate directions so that the resulting solution to be used by the consumer contains 0.13 to 0.5 percent aluminum acetate).

(b) Aluminum sulfate, 46 to 63 percent (the concentration is based on the anhydrous equivalent).

(c) Witch hazel.