Prohibits a long list of specified toxic substances and certain contaminants in cosmetics sold in interstate commerce and amends cosmetic definitions and preemption rules. The bill adds new "adulteration" grounds to federal law (banning intentionally added ortho‑phthalates and formaldehyde‑releasing preservatives; banning 15 named chemicals; and setting contaminant limits for 1,4‑dioxane, lead, and asbestos) and updates statutory definitions. The new rules apply to cosmetics introduced into interstate commerce on or after January 1, 2027, and explicitly allows states and localities to impose equal or stricter ingredient or contaminant limits.