Food emulsifiers, explained
Emulsifiers keep oil and water from separating, which is how a lot of smooth, stable processed food exists at all. They are also the additive group where the science is moving fastest: a real question hangs over what some of them do to the gut. Of the 31 here, 11 are rated avoid and 16 sit on watch.
The reason so many land on “watch” rather than a clear verdict is that the research is genuinely in progress. Studies on carrageenan and some synthetic emulsifiers point to possible effects on the gut lining and microbiome, but it is not fully settled. The naturally derived ones, like lecithin, look clean. Here is where each one stands today.
Avoid · 11
Known or suspected to cause harm: a substance EFSA or another regulator has flagged, or one restricted in some jurisdictions. Best kept out of a regular diet.
E339 — Sodium phosphates
An emulsifier and stabiliser in processed cheese, meats, and frozen foods. It counts toward a total phosphate…
AvoidE340 — Potassium phosphatesAn emulsifier and buffering agent in processed cheese, meat, and powdered drinks. Another added phosphate…
AvoidE341 — Calcium phosphatesThe same mineral your bones are made of, used as a calcium source and anti-caking agent in flour, cereals,…
AvoidE407 — CarrageenanA seaweed-derived thickener in plant milks, dairy, and deli meats. EFSA's 2018 re-evaluation could not…
AvoidE407a — Processed eucheuma seaweedA less-refined form of carrageenan from eucheuma seaweed. Shares the same gut-inflammation concerns and is…
AvoidE442 — Ammonium phosphatidesAn emulsifier used almost exclusively in chocolate, as a cheaper substitute for cocoa butter and lecithin.…
AvoidE450 — DiphosphatesA processed-cheese and meat-product stabiliser that smooths texture and binds water. Heavy daily intake of…
AvoidE451 — TriphosphatesAn emulsifier and water-binder in processed cheese, sausages, and seafood. It adds to a total phosphate…
AvoidE452 — PolyphosphatesChains of phosphate units used to bind water in processed meats and seafood. They push up a total phosphate…
AvoidE471 — Mono- and diglyceridesThe most-used emulsifier in baked goods, margarine, and ice cream. Can carry trans fats when made from…
AvoidE488 — Ethoxylated mono- and diglyceridesA synthetic emulsifier. Yuka moved it from green straight to red in 05/2025 — ethoxylation can leave…
AvoidWatch · 16
Mixed evidence or a specific concern (gut, allergy, or contested safety data). Not alarming, but worth keeping an eye on rather than eating without limit.
E433 — Polysorbate 80
A synthetic emulsifier in ice cream, salad dressings, and pickles. Animal studies suggest gut microbiome…
WatchE445 — Glycerol esters of wood rosinA pine-resin derivative used to keep citrus oils suspended in soft drinks — the job brominated vegetable oil…
WatchE472a — Acetic acid esters of mono- and diglyceridesA modified emulsifier in coffee whiteners, baked goods, and dessert toppings. Considered safe by EFSA, but is…
WatchE472b — Lactic acid esters of mono- and diglyceridesA modified emulsifier used in whipped toppings, cake mixes, and shortenings. Considered safe by EFSA; part of…
WatchE472c — Citric acid esters of mono- and diglyceridesA modified emulsifier in margarines, soft cheeses, and infant formula. Considered safe by EFSA; part of the…
WatchE472d — Tartaric acid esters of mono- and diglyceridesA modified emulsifier in baked goods and dessert mixes. EFSA-cleared at food-level use; part of the broader…
WatchE472e — DATEMA dough-strengthening emulsifier in commercial bread, cakes, and pastries. Considered safe by EFSA; part of…
WatchE472f — Mixed acetic and tartaric acid esters of mono- and diglyceridesA mixed-modification emulsifier in baked goods and confectionery. EFSA-cleared; part of the broader…
WatchE475 — Polyglycerol esters of fatty acidsA synthetic emulsifier used in cakes, whipped toppings and low-fat spreads to keep fat and water combined.…
WatchE477 — Propylene glycol esters of fatty acidsA synthetic emulsifier in cake mixes, whipped toppings, and shortenings. Considered safe by EFSA at typical…
WatchE481 — Sodium stearoyl lactylateAn emulsifier and dough conditioner in commercial bread, cake mixes, and pancake mixes. EFSA-cleared but part…
WatchE491 — Sorbitan monostearateA synthetic emulsifier in baked goods, cake mixes, and whipped toppings. EFSA-cleared at typical use…
WatchE492 — Sorbitan tristearateA synthetic emulsifier used in chocolate and icings to stop fat blooming. Yuka LOWERED the sorbitan ester…
WatchE493 — Sorbitan monolaurateA synthetic emulsifier. Yuka lowered the sorbitan ester family from red to orange in…
WatchE494 — Sorbitan monooleateA synthetic emulsifier. Yuka lowered the sorbitan ester family from red to orange in…
WatchE495 — Sorbitan monopalmitateA synthetic emulsifier. Yuka lowered the sorbitan ester family from red to orange in…
WatchSafe · 4
Cleared by EFSA with no significant concern at typical dietary exposure. Common, well-studied, and not a reason to put a product back on the shelf.
E322 — Lecithins
A natural emulsifier from soya, sunflower, or eggs. Used to blend oil and water in chocolate, margarine, and…
SafeE470a — Sodium, potassium and calcium salts of fatty acidsSoap-like salts of natural fatty acids. Used as anti-caking agents and emulsifiers in salts, sauces, and…
SafeE470b — Magnesium salts of fatty acidsMagnesium stearate. Used as an anti-caking and lubricant agent in supplements, powders, and confectionery.…
SafeE476 — Polyglycerol polyricinoleateA castor-oil-derived emulsifier used in chocolate to reduce cocoa butter content. EFSA reaffirmed safety in…
SafeFrequently asked questions
What are emulsifiers in food?
Emulsifiers are additives that let ingredients that would normally separate, like oil and water, stay mixed. They keep sauces smooth, stop bread going stale, and give ice cream its texture. Common ones include lecithin, mono- and diglycerides (E471), carrageenan and various phosphates.
Which emulsifiers should you avoid?
Of the 31 emulsifiers we track, 11 are rated avoid, including the phosphates (E339 to E452), carrageenan (E407) and mono- and diglycerides (E471). Most of the rest fall into "watch" rather than "avoid", and a few, such as Lecithins and Sodium, potassium and calcium salts of fatty acids, are rated safe.
Are emulsifiers bad for your gut?
This is the active question. A growing body of research suggests some emulsifiers, particularly carrageenan and certain synthetic ones, may disturb the gut lining and microbiome in a way that could promote inflammation. The evidence is still developing rather than settled, which is why several sit in the "watch" or "avoid" band rather than being cleared outright.
Is lecithin safe?
Lecithin (E322), usually from soy or sunflower, is one of the emulsifiers rated safe. It is a naturally occurring substance found in foods like eggs, and it does not carry the concerns attached to the synthetic emulsifiers or carrageenan.