What it is
This is a high-molecular-weight crosspolymer built from an acryloyldimethyltaurate backbone combined with a hydrophobically modified beheneth-25 methacrylate segment. The hydrophobic side chains let it act as an associative rheology modifier, so it thickens water phases and stabilizes oil-in-water emulsions while giving a light, non-tacky slip. In sun care it helps suspend mineral filters, control flow, and deliver an even, cushiony spread.
Safety & warnings
As a large crosslinked polymer it is not appreciably absorbed by skin and is generally well tolerated, with a low likelihood of irritation or sensitization. It is not a known fragrance allergen and is not an oil, so comedogenicity is not a typical concern.
Origin & sourcing
Synthetic. It is produced by polymerizing acrylamido-derived and methacrylate monomers; it is not derived from a natural source.
Questions everyone asks
What does this ingredient do in a sunscreen?
It thickens the formula and keeps the emulsion stable, which helps the product spread evenly and gives it a smooth, gel-like feel.
Is it a UV filter?
No. It provides no sun protection on its own; it is a texture and stability ingredient that supports the actual UV filters.