Is Iron Oxides and Hydroxides (E172) Vegan?

Also known as: Iron oxide black (E172i), Iron oxide red (E172ii), Iron oxide yellow (E172iii), CI 77491, CI 77492, CI 77499

Vegan

Iron oxides are vegan. The pigments are mineral compounds of iron and oxygen, made synthetically for food and cosmetic use to keep heavy metals low. No animal material is involved.

Last checked How we decide

Ingredient Data

Vegan Status

Vegan

E-Number

E172

Also Known As

Iron oxide black (E172i); Iron oxide red (E172ii); Iron oxide yellow (E172iii); CI 77491; CI 77492; CI 77499

Source

Mineral pigments. Food and cosmetic grades are made synthetically, by precipitating iron salts from solution or by controlled oxidation of iron, then calcining the product to fix the shade. Synthesis is preferred over grinding natural ochre because it gives tighter control of heavy metal content.

Commonly Found In

Cake decorations, sugar coatings on sweets, salmon-substitute and vegan seafood products, tablet and capsule coatings, some cheese rinds. Very widely used in cosmetics, especially foundation, eyeshadow, and mascara.

Vegan Alternative

No substitute needed. E172 is vegan.

Additional Notes

Three shades sit under one number: black magnetite, red hematite, and yellow iron oxyhydroxide. Blending them gives the browns and skin tones that dominate foundation shade ranges. In cosmetics the same pigments appear as CI 77491, CI 77492, and CI 77499, drawn from the international color index system.

In depth

Three Pigments, One Number

E172 covers black iron oxide, which is magnetite, red iron oxide, which is hematite, and yellow iron oxyhydroxide, sometimes called iron hydroxide. Humans have used the natural forms as pigments since the Paleolithic; the red and yellow ochres in cave paintings are the same chemistry. Modern production is synthetic. The Penniman process oxidizes scrap iron in the presence of a seed pigment, the Laux process uses the reduction of nitroaromatics, and precipitation routes drop iron salts out of solution with alkali.

Calcination then locks in particle size and shade. Synthesis wins over mining for a specific reason: natural ochre carries whatever else was in the deposit, including lead and arsenic. Food and cosmetic specifications set tight limits on those contaminants, and a controlled reaction meets them reliably. The pigment that results is iron and oxygen, both mineral, and carries no animal component.

Where the Color Turns Up

Food use in the EU is limited. E172 colors sugar coatings on confectionery, decorations for cakes and pastries, and the rind treatment on some cheeses. It also appears in pharmaceutical tablet coatings and gelatin or HPMC capsule shells, where it supplies the beige, brown, and pink shells that identify a medicine. Plant-based seafood analogues have become a growing use.

Red and yellow iron oxides give vegan salmon and tuna substitutes their marbled orange without resorting to carmine or synthetic azo dyes. Cosmetics account for far more volume than food. Foundation shade ranges are built almost entirely from blends of the three iron oxides plus titanium dioxide, which is why a vegan cosmetics label that lists CI 77491 and CI 77492 is showing mineral pigments and nothing more.

Reading Iron Oxides on a Cosmetics Label

Cosmetic ingredient lists use the international color index system, so iron oxides appear as CI 77491 for red, CI 77492 for yellow, and CI 77499 for black. Titanium dioxide sits beside them as CI 77891 and mica as CI 77019. All of those are mineral. The ingredients that make a cosmetic non-vegan sit elsewhere on the list: carmine, listed as CI 75470, plus beeswax, lanolin, silk protein, and animal-derived squalene.

One nuance applies to color cosmetics generally. Vegan composition and cruelty-free testing policy are separate questions, and a foundation built entirely from mineral pigments can still come from a brand that sells into markets requiring animal testing. Certification marks cover that second question; the ingredient list only covers the first.

Frequently asked questions

Is E172 vegan?

Yes. Iron oxides and hydroxides are mineral pigments made from iron and oxygen, produced synthetically for food and cosmetic grades. No animal-derived material is used at any stage.

Are the iron oxides in makeup vegan?

Yes. On cosmetic labels they appear as CI 77491, CI 77492, and CI 77499, and all three are mineral. The animal-derived pigment to watch for in makeup is carmine, listed as CI 75470.

Are iron oxides natural or synthetic?

Both forms exist, but food and cosmetic grades are made synthetically. Natural ochre carries variable amounts of lead and arsenic, and a controlled reaction meets purity specifications that mined pigment cannot reliably meet.

Does E172 add iron to my diet?

Barely. The pigments are used at very low levels and the iron in them is poorly absorbed, so they make no useful contribution to iron intake. Iron fortification uses different compounds, such as ferrous sulfate or ferrous fumarate.

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