CFR › Title 21 › Part 582 › §582.638621 CFR §582.6386Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Product. Isopropyl citrate.(b)Tolerance. This substance is generally recognized as safe for use at a level not exceeding 0.02 percent in accordance with good manufacturing or feeding practice.