What it is
Polyquaternium-67 is a hydroxyethylcellulose backbone modified with quaternary ammonium and hydrophobic substituents, giving it a positive charge that helps it deposit onto skin and hair. In leave-on products it forms a thin conditioning film and can contribute to a smoother surface feel and light slip. It is water soluble and is typically used at low levels.
Safety & warnings
As a high-molecular-weight cellulose polymer, Polyquaternium-67 does not meaningfully penetrate intact skin and is generally considered low-irritation in cosmetic use. It is not a known fragrance allergen and is not a comedogenic oil.
Origin & sourcing
Synthetic derivative of cellulose; a cellulose backbone (plant-derived in origin) is chemically modified with quaternary ammonium and hydrophobic groups.
Questions everyone asks
What is Polyquaternium-67 made from?
It is a cellulose-based polymer that has been chemically modified with charged and oil-loving groups to make it deposit onto skin and hair.
Why is it used in a sunscreen?
It acts as a film former and conditioning agent, helping leave a smooth, even feel on the skin.