21 CFR § 520.2100 - Selenium and vitamin E.

---
identifier: "/us/cfr/t21/s520.2100"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.2100 - Selenium and vitamin E."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.2100"
section_name: "Selenium and vitamin E."
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: "520"
part_name: "ORAL DOSAGE FORM NEW ANIMAL DRUGS"
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. 360b."
regulatory_source: "40 FR 13838, Mar. 27, 1975, unless otherwise noted."
cfr_part: "520"
---


# 520.2100 Selenium and vitamin E.

(a) *Specifications.* Each capsule contains:

(1) 2.19 milligrams (mg) sodium selenite (equivalent to 1 mg selenium) and 56.2 mg (68 I.U.) vitamin E as d-alpha tocopheryl acid succinate; or

(2) 0.548 mg sodium selenite (equivalent to 0.25 mg selenium) and 14 mg (17 I.U.) vitamin E as d-alpha tocopheryl acid succinate.

(b) *Sponsor.* See No. 000061 in § 510.600(c) of this chapter.

(c) *Conditions of use in dogs*—(1) *Amount.* (i) Dogs over 20 pounds: Administer 1 capsule described in paragraph (a)(1) per 20 pounds of body weight to a maximum of 5 capsules. Repeat at 3 day intervals until a satisfactory therapeutic response is observed. Maintenance dosage is 1 capsule per 40 pounds of body weight every 3 to 7 days, or longer, as required.

(ii) Dogs under 20 pounds: Administer 1 capsule described in paragraph (a)(2) per 5 pounds of body weight with a minimum of 1 capsule. Repeat at 3-day intervals until a satisfactory response is observed. Maintenance dosage is 1 capsule per 10 pounds of body weight every 3 to 7 days, or longer, as required.

(2) *Indications for use.* As an aid in alleviating and controlling inflammation, pain, and lameness associated with certain arthropathies.

(3) *Limitations.* Federal law restricts this drug to use by or on the order of a licensed veterinarian.

[79 FR 28828, May 20, 2014]