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Emulsifier

E479b (thermally oxidised soya bean oil): what it is, its sources, vegan or not

E479b can come from plant oils, soy or animal fat, and the pack rarely says which. Vegetarian and vegan profiles get Heads up: source not stated.

By Bravoora teamUpdated 13 October 2026Sources checked 20 September 20264 sourcesHow we check

Heads up

for a vegan profile

E479b=source not stated

What is E479b?

E479b (thermally oxidised soya bean oil) is an emulsifier, an additive that keeps oil and water mixed in a food.

What is E479b made from?

E479b can come from plant oils, soy or animal fat. Made from heated soya bean oil and mono- and diglycerides (E471), which can come from plant oils or animal fat.

Plant oils
SoyDeclared allergenRead the soy guide
Animal fat

Is E479b vegan?

Heads up. Source not stated. E479b can come from plant oils, soy or animal fat. The pack does not have to say which, so the app says Heads up instead of guessing.

What the app says to each profile, and the reason it shows.

VeganHeads upSource not stated. E479b can come from plant oils, soy or animal fat. The pack does not have to say which, so the app says Heads up instead of guessing.

VegetarianHeads upSource not stated. E479b can come from plant oils, soy or animal fat. One of those is meat, fish or a slaughter by-product, and the pack does not have to say which.

Soy allergyHeads upIt can come from soy. In the EU, UK, US and Gulf a label must name soy when that is the source, so read the Contains line.

What other names does E479b have on a label?

On a label, E479b can also appear as “INS 479b”, “Emulsifier (479b)”, “Emulsifier (E479b)”, “Thermally oxidised soya bean oil interacted with mono- and diglycerides of fatty acids” or “TOSOM”.

Any of these on a pack means E479b. The checker reads them all.

E479bE 479bE-479bINS 479bEmulsifier (479b)Emulsifier (E479b)Thermally oxidised soya bean oil interacted with mono- and diglycerides of fatty acidsTOSOM

What would change the answer for E479b?

For E479b, a stated source changes the answer. A pack that says “from plant oils” gives Fits you; one that says “from animal fat” gives Not for you. A list that is cut off or unreadable gets Needs one more scan.