E-numbers / Preservatives / E215
also: Sodium ethylparaben · Ethylparaben sodium salt · Sodium ethyl p-hydroxybenzoate
A synthetic preservative from the paraben family, added to stop mould, yeast and bacteria growing in processed foods.
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Parabens mildly mimic the hormone oestrogen.
Why it’s worth knowing. Parabens mildly mimic the hormone oestrogen. Ethylparaben specifically has shown estrogenic effects in animal studies at doses close to the acceptable daily intake, and early research links gestational paraben exposure to externalizing behaviour problems in young children. Ethylparaben also shows the strongest association among parabens with thyroid cancer risk in observational studies.
Sodium ethyl para-hydroxybenzoate is the sodium salt of ethylparaben, a synthetic compound derived from para-hydroxybenzoic acid. The sodium salt form is more water-soluble than the parent ester ethylparaben (E214), making it more practical in water-based food products. It belongs to the paraben family of antimicrobial preservatives.
Disrupts the cell membranes of bacteria, yeasts and moulds and interferes with their enzyme activity, halting their ability to reproduce. Effective across a broad pH range, which gives it an advantage over some other preservatives in acidic or neutral foods.
Permitted in the UK and EU for use as a surface treatment on dried meat products, in jelly coatings on meat products such as pate, in confectionery (excluding chocolate), and in liquid dietary food supplements. In practice, parabens see very limited use in UK and EU food manufacturing, with major UK food producers reported to avoid them due to flavour objections and consumer pressure for paraben-free products. On a label, look for E215 or sodium ethyl p-hydroxybenzoate in the ingredients list.
Parabens bind to oestrogen receptors and trigger oestrogen-like effects in laboratory and animal tests. Ethylparaben showed uterotrophic effects (uterine growth indicative of oestrogen activity) in immature rats at doses close to the acceptable daily intake, with estrogen-responsive genes significantly upregulated. An estrogen-receptor antagonist blocked these effects, confirming the mechanism was genuinely oestrogen-driven. The strength of this effect increases with the length of the alkyl chain, so propylparaben is more potent than ethylparaben.
Ethylparaben produced uterotrophic effects in immature rats at 4 and 20 mg/kg body weight per day, with no-observed-effect level at 0.8 mg/kg per day. Urinary paraben levels in treated rats matched peak human exposure concentrations reported in epidemiological studies, suggesting current ADI guidelines may not fully protect against endocrine-disrupting effects.
Parabens show weak oestrogen-like activity in laboratory and animal tests. Estrogenicity increases with alkyl chain length; ethylparaben is more potent than methylparaben but less so than propyl or butylparaben.
EFSA's AFC Panel concluded that ethyl and methyl parabens and their sodium salts share a group acceptable daily intake of 0-10 mg/kg body weight per day, based on long-term toxicity data. Propylparaben was excluded from this group ADI due to effects on sperm production in juvenile male rats at relatively low doses.
Beyond oestrogen mimicry, parabens can interfere with the thyroid hormone axis. Animal and human studies have documented changes in thyroid-stimulating hormone and thyroid hormone levels after paraben exposure, with effects varying by paraben type. Of the parabens studied, ethylparaben showed the strongest association with thyroid cancer risk in observational research.
Ethylparaben exposure was associated with the greatest risk of thyroid cancer among parabens studied in human observational data. Animal models showed decreased thyroid hormone concentrations, with toxicity increasing with alkyl chain length.
Observational studies have tracked women's paraben exposure during pregnancy and followed up on their children's behaviour in early childhood. Several cohort studies found associations between higher urinary paraben levels in pregnancy and increased externalizing behaviours such as attention problems and aggression in children aged two to four, with ethylparaben showing consistent associations across multiple time points. These are associations from observational data, not proof of cause.
A cohort study assessed gestational exposure to methyl, ethyl and propyl paraben and child behaviour via the Child Behavior Checklist at ages 2, 3 and 4. Each paraben was associated with increased externalizing behaviours; ethylparaben showed the most consistent associations, including with attention problems and ADHD problems.
The MARBLES cohort found that a mixture of environmental phenols and parabens during pregnancy was associated with a significantly increased risk of non-typical neurodevelopment (odds ratio 1.58). Individual paraben associations including ethylparaben were borderline but the authors noted a small sample size and called for replication.
Parabens have been detected as intact esters in human breast cancer tissue, blood, urine and breast milk. This established that parabens can penetrate human skin and gut tissue without full breakdown, and accumulate in body tissues. The significance of this for cancer risk is not established; the finding showed biological access, not a causal link to tumours.
Review of studies since 2004 confirmed intact paraben esters are measurable in human breast cancer tissues, urine and systemic circulation. Parabens possess androgen antagonist activity in addition to weak oestrogenicity. The authors called for investigation of whether parabens contribute to breast cancer, male reproductive impairment or melanoma.
People trying to minimise dietary oestrogen-mimicking chemical exposure may wish to check labels of processed meat products, confectionery and liquid food supplements for E215 or sodium ethyl p-hydroxybenzoate. Parents of young children may wish to note the emerging observational evidence linking gestational paraben exposure to behaviour in early childhood, though this research is ongoing.
E215 is approved for use in a narrow set of processed foods in the UK and EU, and it sees only limited real-world use because the food industry has largely moved away from parabens in response to consumer pressure and flavour concerns. At the same time, the science is not settled. Lab and animal studies confirm that ethylparaben acts on oestrogen receptors at doses not dramatically above those that regulators regard as acceptable, and the 2004 EFSA opinion that underpins the current ADI predates much of the more recent mechanistic and epidemiological research. Observational studies linking gestational paraben exposure to child behaviour problems are growing in number and consistency, though they measure mixtures of parabens rather than E215 in isolation, and observational associations are not proof of harm. The question of whether current permitted exposure levels are adequate protection against endocrine-disrupting effects has not been formally answered at regulator level. The science is live, not settled.
No. E215 is an approved food additive in the UK under the assimilated EU Regulation 1333/2008. It is permitted in a small number of specific food categories including dried meat surface treatments, jelly-coated meat products, confectionery (excluding chocolate) and liquid dietary food supplements.
Lab and animal studies show ethylparaben binds to oestrogen receptors and triggers oestrogen-like responses, which is why it is considered a potential endocrine-disrupting chemical. Longer-chain parabens (butylparaben, isobutylparaben) are on the EU's formal identified-endocrine-disruptors register; ethylparaben is not individually listed there. Regulators have not formally revised the ADI on this basis, but the research underpinning current limits dates to 2004 and the question of whether current permitted levels are adequate protection remains open.
E215 is only approved for a narrow set of UK food uses: surface treatment of dried meat products, jelly coatings on pate and similar meat products, confectionery (excluding chocolate) and liquid dietary food supplements. In practice it is rarely encountered because UK food manufacturers have largely moved away from paraben preservatives. Check the ingredients list for E215 or sodium ethyl p-hydroxybenzoate.
E215 is a synthetic compound made from para-hydroxybenzoic acid. The ingredient itself contains no animal-derived components and is suitable for vegans and vegetarians. However, many of the foods it is permitted in (such as pate and dried meat) are not vegan.
Last reviewed: 20 June 2026
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