Propylparaben
Propylparaben (Propyl 4-Hydroxybenzoate, CAS# 94-13-3) is a widely used synthetic preservative belonging to the paraben family. It functions primarily to prevent microbial growth and extend the shelf life of cosmetic formulations. It also carries a secondary perfuming function per official CosIng classification. It is subject to cosmetic use restrictions (V/12) and has been reviewed in SCCS Opinion 1514/13.
Propylparaben is a cheap, effective, and well-tolerated preservative that helps ensure cosmetic formulas remain safe and stable over time. It has a long history of use and is considered effective at low concentrations.
Subject to EU cosmetic use restrictions (V/12); has been the subject of SCCS scientific review (Opinion 1514/13 on propyl- and butylparaben). Widely perceived as a concern by consumers, though the source notes this is "mostly without scientific reason."
