Propyl paraben

Additive · E 216

Propyl paraben is a preservative used to slow the growth of molds, yeasts and some bacteria in food. It helps products keep longer during storage. Labels may call it propylparaben or propyl p-hydroxybenzoate; it is distinct from other paraben preservatives.

Also known as

propyl paraben · propylparaben · propyl p-hydroxybenzoate · propyl 4-hydroxybenzoate · benzoic acid, 4-hydroxy-, propyl ester · benzoic acid, p-hydroxy-, propyl ester · n-propyl ester of p-hydroxybenzoic acid · n-propyl ester of 4-hydroxybenzoic acid · propyl p-oxybenzoate · propyl para-hydroxybenzoate · E 216 · INS 216

Why PRūF tracks it

Reproductive and hormone findings conflict, with substantial uncertainty about ordinary dietary exposure; reassuring guideline animal studies and recent human clinical findings limit confidence that food intake harms fertility.

Read the research

Propyl paraben helps preserve food by limiting microbial growth. Its main health question concerns hormone activity and reproduction, rather than an established human cancer risk. Results conflict: guideline oral rat studies found no reproductive harm at high tested doses, while other experiments raise ovarian and developmental concerns. A 2025 mouse study reported effects across generations after injections during pregnancy; injections differ from eating a preservative, and its human comparison did not measure paraben exposure.

A separate oral mouse study during pregnancy and nursing found persistent mammary changes, including some low-dose proliferation findings, but did not measure tumors and found no differences in litter size or pup survival. Human studies measure exposure from multiple sources, including personal care products, so their findings cannot isolate food intake. A 2025 fertility study found a thinner uterine lining at higher measured exposure but no association with pregnancy or live birth; another pregnancy study found no overall gestational diabetes association. These findings support continued concern without proving that a normal serving harms fertility.

US rules permit limited food use while FDA reassesses it. The EU withdrew food authorization; California and Arkansas have enacted broader bans starting in 2027 and 2028.

Research reviewed on September 5, 2026 · 12 sources