CFR › Title 21 › Part 582 › §582.543421 CFR §582.5434Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Product. Magnesium phosphate (di- and tribasic).(b)Conditions of use. This substance is generally recognized as safe when used in accordance with good manufacturing or feeding practice.