Abstract
The Expert Panel for Cosmetic Ingredient Safety (Panel) assessed the safety of 46 butyl polyoxyalkylene ethers that share a common structural motif, namely a butyl chain (4 carbon alkyl chain) bound to a polyoxyalkylene (PPG, PEG, or both); 23 of these ethers were previously reviewed by the Panel, and 23 are reviewed herein for the first time. Most of the butyl polyoxyalkylene ethers have several functions in cosmetics, but the most common reported functions include hair conditioning agent and skin conditioning agent, and many reportedly function as solvents. Upon review of new data, including frequency and concentration of use, and data from previous Panel reports and on read-across analogs, the Panel concluded that these ingredients are safe in the present practices of use and concentration in cosmetics when formulated to be non-irritating.
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