Site Feedback

Title 21

Displaying title 21, up to date as of 7/13/2026. Title 21 was last amended 7/09/2026.
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

Title 21Food and DrugsPart / Section
Chapter IFood and Drug Administration, Department of Health and Human Services1 – 1299
Subchapter EAnimal Drugs, Feeds, and Related Products500 – 599
Part 573Food Additives Permitted in Feed and Drinking Water of Animals573.120 – 573.1020
Subpart BFood Additive Listing573.120 – 573.1020
§ 573.120Acrylamide-acrylic acid resin.
§ 573.130Aminoglycoside 3′-phospho- transferase II.
§ 573.140Ammoniated cottonseed meal.
§ 573.160Ammoniated rice hulls.
§ 573.170Ammonium formate.
§ 573.180Anhydrous ammonia.
§ 573.200Condensed animal protein hydrolysate.
§ 573.210Benzoic acid.
§ 573.220Feed-grade biuret.
§ 573.2251,3-Butylene glycol.
§ 573.230Calcium formate.
§ 573.240Calcium periodate.
§ 573.260Calcium silicate.
§ 573.280Feed-grade calcium stearate and sodium stearate.
§ 573.300Choline xanthate.
§ 573.304Chromium propionate.
§ 573.310Crambe meal, heat toasted.
§ 573.320Diammonium phosphate.
§ 573.340Diatomaceous earth.
§ 573.360Disodium EDTA.
§ 573.380Ethoxyquin in animal feeds.
§ 573.400Ethoxyquin in certain dehydrated forage crops.
§ 573.420Ethyl cellulose.
§ 573.440Ethylene dichloride.
§ 573.450Fermented ammoniated condensed whey.
§ 573.460Formaldehyde.
§ 573.480Formic acid.
§ 573.485Fumonisin esterase.
§ 573.490Gamma-linolenic acid safflower meal.
§ 573.492Gamma-linolenic acid safflower oil.
§ 573.496Guanidinoacetic acid.
§ 573.500Condensed, extracted glutamic acid fermentation product.
§ 573.520Hemicellulose extract.
§ 573.530Hydrogenated corn syrup.
§ 573.540Hydrolyzed leather meal.
§ 573.55025-hydroxyvitamin D3.
§ 573.560Iron ammonium citrate.
§ 573.580Iron-choline citrate complex.
§ 573.587Komagataella pastoris dried yeast.
§ 573.600Lignin sulfonates.
§ 573.615Marine microalgae.
§ 573.620Menadione dimethylpyrimidinol bisulfite.
§ 573.625Menadione nicotinamide bisulfite.
§ 573.637Methyl esters of conjugated linoleic acid (cis-9, trans-11 and trans-10, cis-12-octadecadienoic acids).
§ 573.640Methyl esters of higher fatty acids.
§ 573.660Methyl glucoside-coconut oil ester.
§ 573.680Mineral oil.
§ 573.685Natamycin.
§ 573.696Feed grade sodium formate.
§ 573.700Sodium nitrite.
§ 573.720Petrolatum.
§ 573.740Odorless light petroleum hydrocarbons.
§ 573.760Poloxalene.
§ 573.780Polyethylene.
§ 573.800Polyethylene glycol (400) mono- and dioleate.
§ 573.820Polyoxyethylene glycol (400) mono- and dioleates.
§ 573.840Polysorbate 60.
§ 573.860Polysorbate 80.
§ 573.870Poly(2-vinylpyridine-co-styrene).
§ 573.880Normal propyl alcohol.
§ 573.900Pyrophyllite.
§ 573.914Salts of volatile fatty acids.
§ 573.920Selenium.
§ 573.940Silicon dioxide.
§ 573.960Sorbitan monostearate.
§ 573.980Taurine.
§ 573.1000Verxite.
§ 573.1010Xanthan gum.
§ 573.1020Yellow prussiate of soda.