PEG-33 is the synthetic polymer of ethylene oxide used as a binding agent and humectant. With any PEG ingredient followed by a number, the lower the number, the lighter the ingredient. Thus, PEG-33 will feel lighter on skin than PEG-200.

References for this information:

International Journal of Toxicology, November 2014, pages 13Sā€“39S
International Journal of Toxicology, May 1997, pages 269ā€“300


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