The Cosmetic Hazardous Ingredient Right to Know Act of 2025 aims to significantly increase transparency regarding cosmetic ingredients, especially fragrances and flavors, for both consumer and professional use products. It amends the Federal Food, Drug, and Cosmetic Act to establish new disclosure requirements for brand owners. Cosmetics will be considered misbranded if required ingredient information is not properly disclosed on packaging or websites. Within one year, brand owners must provide a full listing of each ingredient , including fragrance and flavor components, in descending order of predominance on their websites in an electronically readable format . This online disclosure must also include the functional purpose of fragrance and flavor ingredients and links to relevant hazard lists for specific ingredients. For professional-use cosmetics, a link to the hazard communication safety data sheet is also required. Two years after enactment, cosmetic packaging or labeling must include a full ingredient list, again in descending order of predominance. If any ingredient is present from a comprehensive set of specified hazardous chemical lists , the label must direct consumers to the brand owner's website for health impact information. These lists encompass chemicals identified as carcinogenic, neurotoxic, persistent, bioaccumulative, or toxic by various federal, state, and international authorities. The bill mandates the Secretary of the FDA to establish and maintain a publicly available master list of these chemicals within six months, with semi-annual updates, while explicitly preserving the right of states to implement or continue requirements that provide greater transparency, disclosure, or protection for cosmetic ingredients.