US lawFederal (United States)RegulationsTitle 21 CFR — Food and DrugsChapter I — FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICESPart 573 — FOOD ADDITIVES PERMITTED IN FEED AND DRINKING WATER OF ANIMALSSubpart B — Food Additive Listing573.90021 C.F.R. § 573.900Pyrophyllite.Last amended: 2016Year: 2026Length: 37 wordsOfficial source Cite as 21 C.F.R. § 573.900 (2026)Pyrophyllite (aluminum silicate monohydrate) may be safely used as the sole anticaking aid, blending agent, pelleting aid, or carrier in animal feed when incorporated therein in an amount not to exceed 2 percent in complete animal feed.Previous21 C.F.R. § 573.880Next21 C.F.R. § 573.914