CFR › Title 21 › Part 556 › §556.12021 CFR §556.120Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)[Reserved](b)Tolerances. The tolerance for chlorhexidine is:(1)Cattle. Edible tissues (excluding milk): Zero.(2)[Reserved](c)Related conditions of use. See § 529.400 of this chapter.