At a glance
How does Polysorbate 80 appear on a UK label?
Useful label-reading detail
Presence identifies the emulsifier, not the dose. Keep ex-vivo, animal and human evidence separate.
How it is classified
A synthetic emulsifier and possible NOVA formulation marker. It is not a FODMAP.
Why amount matters
Experimental concentrations and food exposure are not interchangeable. Labels generally do not disclose the amount.
Evidence by study type
What do studies show about Polysorbate 80?
What was studied: The Naimi study exposed cultured human gut microbial communities outside the body. A later 60-person trial tested P80 among six small arms.
What it cannot tell us: Neither design establishes a long-term health effect from a quantity shown on an ordinary food label.
What human studies show about Polysorbate 80
A 2026 exploratory multi-emulsifier trial included a small P80 arm and did not find overall inflammatory or metabolic differences between its six groups. It was not large or long enough to settle long-term effects.
SourcesUK approved-additives listGreat Britain food-additive registerEFSA polysorbates assessment2021 ex-vivo emulsifier study2026 emulsifier trial2015 mouse emulsifier study
What animal or laboratory studies suggest about Polysorbate 80
Mouse studies report microbiota, mucus and inflammatory changes under some conditions. Ex-vivo human-microbiota models show that P80 can alter microbial composition and activity, but an ex-vivo model is not a clinical outcome.
SourcesUK approved-additives listGreat Britain food-additive registerEFSA polysorbates assessment2021 ex-vivo emulsifier study2026 emulsifier trial2015 mouse emulsifier study
What we still do not know about Polysorbate 80
Clinically meaningful effects at common intake, long-term outcomes and individual susceptibility remain uncertain.
Great Britain regulatory context
E433 is authorised in Great Britain. EFSA established a group acceptable daily intake of 25 mg/kg body weight per day for polysorbates including E433.
SourcesUK approved-additives listGreat Britain food-additive registerEFSA polysorbates assessment2021 ex-vivo emulsifier study2026 emulsifier trial2015 mouse emulsifier study
Common questions
Questions people ask about this label
Are polysorbate 80, Tween 80 and E433 the same?
Yes. They are common, trade and E-number names for polysorbate 80.
SourcesUK approved-additives list
What human evidence exists for E433?
Human evidence is limited. The newest exploratory multi-arm trial did not find overall inflammatory or metabolic differences, while reporting changes in some intestinal measures across emulsifier groups.
Sources2026 emulsifier trial
Why is an ex-vivo study not a human health result?
Ex-vivo work studies human-derived microbes outside the body. It can test biological plausibility, but it cannot include absorption, immune responses, normal diet or symptoms in a living person.
References
Sources used for this page
- Food Standards Agency, Approved additives and E numbers
- Food Standards Agency, Register of food-additive authorisations for Great Britain
- EFSA ANS Panel (2015), Re-evaluation of polysorbates including E433
- Naimi et al. (2021), Direct impact of commonly used emulsifiers on human gut microbiota ex vivo
- Wellens et al. (2026), Placebo-controlled trial of five dietary emulsifiers
- Chassaing et al. (2015), Dietary emulsifiers impact the mouse gut microbiota
Written and evidence-checked by the GutGuard editorial team. We favour official UK guidance, systematic reviews and primary human research, and label animal, laboratory and exploratory findings clearly. Read our editorial method.