Polyglycerol esters
A food emulsifier made from vegetable fats and glycerol, used to keep oil and water blended together in baked goods and sauces.
What is it?
Polyglycerol esters of fatty acids (PGEF) are emulsifiers produced by reacting polymerised glycerol with edible fatty acids, typically from vegetable oils such as sunflower, rapeseed, or palm. The result is a group of closely related compounds that sit at the oil-water boundary in food. They are distinct from their close relative E476 (polyglycerol polyricinoleate), which is derived from castor oil.
What does it do?
E475 acts as an emulsifier: it lowers the surface tension between fat and water phases so they stay blended rather than separating. In bread and cakes it also interacts with starch and gluten proteins, improving dough handling, delaying staling, and giving a softer crumb. In chocolate coatings and fat-based fillings it controls viscosity and crystal formation.
Where you will see it
Most commonly found in fine bakery goods (cakes, biscuits, pastries), bread improvers, margarine, chocolate cake coatings, dessert mixes, and some soups and sauces where fat-water stability is needed. On a UK label it appears as 'polyglycerol esters of fatty acids', 'polyglycerol esters', or 'E475'.
What the science says
How the body processes it
In the gut, E475 is broken down almost completely into its component parts: polyglycerols and fatty acids. Very little intact PGEF is absorbed into the bloodstream. The fatty acids enter normal fat metabolism and the polyglycerols are largely excreted. This rapid and near-complete breakdown was a key factor in the conclusion that no numerical daily intake limit was needed.
Absorption of intact polyglycerol esters in the gastrointestinal tract is extremely low; the compounds are rapidly and almost fully hydrolysed to polyglycerols and fatty acids before absorption.
Toxicology studies
Short-term, subchronic, and chronic animal feeding studies with polyglycerol esters have not shown adverse effects at any dose tested. No genotoxicity signals were found in standard mutagenicity assays. EFSA concluded the available data did not identify a dose that caused harm, so setting a numerical acceptable daily intake was not considered necessary.
No adverse effects of polyglycerol esters of fatty acids were observed in short-term, subchronic, or chronic toxicity studies at any dose level tested in animals.
No evidence of genotoxicity was found in in vitro or in vivo assays conducted as part of the safety re-evaluation.
Specification impurities
A 2022 EFSA follow-up looked not at the additive itself but at contaminants that can arise during manufacturing: heavy metals (arsenic, lead, mercury, cadmium), erucic acid, 3-monochloropropanediol (3-MCPD) and glycidyl esters. EFSA recommended tightening the EU specification limits for all of these. The concern here is about manufacturing quality control, not about the emulsifier compound itself.
EFSA recommended lower maximum limits for arsenic, lead, mercury, and cadmium in E 475 specifications, and the addition of limits for erucic acid, 3-MCPD, and glycidyl esters based on commercial product analysis.
Where it stands with the regulators
Who should be careful
No group is specifically advised to avoid E475 based on the additive itself. People managing fat intake from specific sources (such as palm-derived ingredients) may wish to note that the source fatty acid is not always declared on the label; if the source matters, contact the manufacturer. The label term to look for is 'polyglycerol esters of fatty acids' or 'E475'.
The honest read
Polyglycerol esters are one of the more thoroughly evaluated emulsifiers in the food additive system: two EFSA opinions in 2017 and 2022, decades of JECFA review, and animal feeding studies across multiple generations without identified adverse effects. The 2022 opinion tightened specification limits for manufacturing impurities, which is a routine quality-control step, not a signal about the emulsifier compound itself. The science here is not live or contested; the additive has been in widespread use since the mid-twentieth century and the repeated review has not produced a concern.
Related additives
Common questions
Is E475 banned in the UK?
No. Polyglycerol esters of fatty acids (E475) are approved for use in food in both the UK and the EU under Regulation 1333/2008 as assimilated into UK law. The UK FSA lists it as a permitted food additive.
Why did EFSA review E475 twice?
The 2017 review was a systematic re-evaluation of the safety of E475 itself, concluding no numerical daily intake limit was needed. The 2022 follow-up was narrower: it looked only at trace contaminants that can be present from manufacturing (such as heavy metals and processing impurities) and recommended tighter specification limits. The two reviews address different questions.
What foods contain E475?
Most commonly cakes, biscuits, pastries, and other fine bakery goods where it helps doughs handle better and keeps the crumb soft. It also appears in margarine, chocolate cake coatings, and some soups or sauces. Check the ingredients list for 'polyglycerol esters of fatty acids' or 'E475'.
Is E475 vegan?
It depends on the source fatty acid. Polyglycerol esters are usually made from vegetable oils (sunflower, rapeseed, palm), making them vegan in most commercial applications. However, animal-derived fatty acids can technically be used. The source is rarely declared on the label, so those who need certainty should contact the manufacturer.
Sources
- EFSA ANS Panel: Re-evaluation of polyglycerol esters of fatty acids (E 475) as a food additive (2017)
- EFSA FAF Panel: Follow-up of the re-evaluation of polyglycerol esters of fatty acids (E 475) as a food additive (2022)
- PubMed: Re-evaluation of polyglycerol esters of fatty acids (E 475) as a food additive
- PMC: Follow-up of the re-evaluation of polyglycerol esters of fatty acids (E 475)
- UK FSA: Approved additives and E numbers
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