Emulsifiers
Polysorbate 20
Definition
What it is
Synthetic emulsifier: polysorbates and carboxymethylcellulose were shown in a landmark 2015 Nature study to disrupt gut microbiome composition, thin the intestinal mucus layer, and promote colitis and metabolic syndrome in mice.
On the label
How it appears on labels
- polysorbate 20
- e432
Regulation
Regulatory status
No bans or restrictions are recorded for this ingredient in the jurisdictions clearlabel tracks (US, EU, UK, Canada, Japan, Australia/NZ, Brazil).
Explainer
In plain language
Polysorbate 20 is a synthetic emulsifier that helps oil and water stay mixed and keeps textures smooth. In food it appears in small amounts to prevent separation and to disperse flavors and vitamins. It is made by reacting a sugar-alcohol derivative with fatty acids and ethylene oxide.
Assessment
Why it is flagged
Concern about polysorbates grew after a 2015 study in Nature, led by Chassaing and colleagues, found that dietary emulsifiers including polysorbate 80 and carboxymethylcellulose altered the gut microbiome, thinned the protective mucus layer, and promoted intestinal inflammation and metabolic changes in mice. That work used specific emulsifiers at doses in mice, and human evidence is still limited and ongoing, so the findings raise a real question rather than proving harm in people. Polysorbate 20 belongs to the same chemical family, though most of the animal research focused on polysorbate 80. Regulators in the US and EU continue to permit it. Clear Label flags it at high severity because emulsifier effects on gut health are an active area of research, and because some people with sensitive digestion choose to track it in their own logs.
In the aisle
Where it commonly shows up
- Some ice creams and frozen desserts
- Whipped and dessert toppings
- Some sauces and dressings
- Vitamin and flavor preparations in drinks
- Some baked goods and icings
Practical
Reading the label
Polysorbate 20 is listed by name in US ingredient lists and can appear as E432 in the EU. It is used in small quantities, so it often sits near the end of the ingredient list.
Alternatives
If you want to avoid it
Some people who limit synthetic emulsifiers choose products that rely on lecithin, egg, or simply fewer ingredients for texture. Comparing two similar products side by side often reveals a version without added polysorbates.
FAQ
Common questions
Is polysorbate 20 banned anywhere?
No. It is permitted as a food additive in the US and EU within set limits. The gut research has prompted debate but not a ban.
Does the 2015 mouse study apply to people?
Not directly. The Nature study observed effects in mice at defined doses, mostly with polysorbate 80 and carboxymethylcellulose. Human trials are still limited, so the results are a reason to watch the ingredient rather than a proven effect in people.
Is polysorbate 20 the same as polysorbate 80?
They are close chemical relatives in the same family but not identical. Most of the widely cited gut research used polysorbate 80, while polysorbate 20 is grouped with it because of the shared structure.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.