California Code, Health and Safety Code - HSC § 111822.2

(a) A package or box containing menstrual products that was manufactured on or after January 1, 2023, for sale or distribution in this state shall have printed on the label a plain and conspicuous list of all ingredients in the product.

(b) The ingredients shall be listed in order of predominance by weight in the menstrual product, except that ingredients present at a weight below one percent may be listed in any order following the other ingredients. Ingredients shall be identified using a standardized nomenclature, including, but not limited to, the International Nomenclature of Cosmetic Ingredients (INCI), the Household Commercial Products Association's Consumer Product Ingredient Dictionary (HCPA Dictionary), or common chemical name. If a standardized nomenclature does not otherwise exist for an ingredient, a name established by the Center for Baby and Adult Hygiene Products (BAHP) shall be used by all menstrual product manufacturers. A manufacturer may identify any ingredient that is confidential business information by its common name to protect its confidential identity.

(c) Commencing January 1, 2023, a manufacturer of a menstrual product that is manufactured for sale or distribution in the state shall post on an internet website, in an electronically readable format, the ingredient information that is required to be disclosed on a package or box containing menstrual products pursuant to subdivision (a).

(d) This section does not prohibit a manufacturer from using technologies, including, but not limited to, digital link, to communicate the information required by this section.