CFR › Title 21 › Part 582 › §582.504921 CFR §582.5049Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Product. Glycine (aminoacetic acid).(b)[Reserved](c)Limitations, restrictions, or explanation. This substance is generally recognized as safe when used in animal feeds in accordance with good manufacturing or feeding practice.