What it is
PEG-12 is a water-soluble polyethylene glycol, with the number indicating the average degree of ethylene oxide polymerization. In formulas it functions as a humectant that helps retain moisture, as a solvent to keep other ingredients in solution, and as a texture and viscosity modifier. It is widely used across skincare and sun care for its mild, predictable behavior.
Safety & warnings
Polyethylene glycols of this molecular weight are generally well tolerated on intact skin and are not recognized fragrance allergens or notable comedogens. As with other PEGs, manufacturing controls limit residual impurities, and tolerability is considered good at typical cosmetic levels.
Origin & sourcing
Synthetic; produced by the controlled polymerization of ethylene oxide to a defined average chain length.
Questions everyone asks
What is the role of PEG-12 in a formula?
It works mainly as a humectant and solvent, helping hold moisture, keep ingredients in solution, and fine-tune texture and viscosity.
What does the number 12 mean?
It indicates the average number of ethylene oxide units in the polymer chain, which corresponds to an average molecular weight near 600.