21 CFR § 573.240 - Calcium periodate.

---
identifier: "/us/cfr/t21/s573.240"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 573.240 - Calcium periodate."
title_number: 21
title_name: "Food and Drugs"
section_number: "573.240"
section_name: "Calcium periodate."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "E"
subchapter_name: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"
part_number: "573"
part_name: "FOOD ADDITIVES PERMITTED IN FEED AND DRINKING WATER OF ANIMALS"
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, 342, 348."
regulatory_source: "41 FR 38652, Sept. 10, 1976, unless otherwise noted."
cfr_part: "573"
---


# 573.240 Calcium periodate.

The food additive calcium periodate may be safely used in accordance with the following prescribed conditions:

(a) The additive is produced by reacting calcium iodate with calcium hydroxide or calcium oxide to form a substance consisting of not less than 60 percent by weight of penta calcium orthoperiodate containing 28 to 31 percent by weight of iodine.

(b) It is used or intended for use in salt for livestock as a source of iodine.