Vegan or Vegetarian on an Ingredients Label

Two words that diverge in one aisle

A vegetarian diet excludes animals that were killed. A vegan diet excludes animal products entirely, whether the animal survived the process or not.

That single difference is easy to state and surprisingly hard to apply, because ingredient labels describe function rather than origin. Emulsifier, stabiliser, gelling agent, and anti-caking agent all tell you what a substance does in the food and stay silent about where it came from.

The practical result is three groups. One clears both diets. One clears vegetarian and fails vegan. One fails both. Sorting a label becomes much faster once you know which group a code lands in.

The group that fails both diets

These come from animals that were slaughtered. Vegetarians and vegans both exclude them.

Ingredient	Code	Origin
Gelatin	E441	Boiled skin, bones, and connective tissue of pigs, cattle, or fish
Bone phosphate	E542	Bones of slaughtered cattle or pigs, ground to a powder
Bone char	—	Charred cattle bones, used as a filter in cane sugar refining
Disodium inosinate	E631	Traditionally fish or meat
Disodium 5’-ribonucleotides	E635	A blend containing E631
Tallow	—	Rendered fat from cattle or sheep
Isinglass	—	Dried swim bladders of fish, used to clarify beer and wine
Animal rennet	—	Stomach lining of slaughtered calves, lambs, or kid goats

Two of these deserve a flag because they rarely appear on a label at all.

Isinglass and animal rennet are processing aids. They act during production and are largely filtered out of the finished product, which in most jurisdictions means they escape the ingredients list entirely. A cask ale fined with isinglass and a cheddar set with calf rennet can both read as blameless on the pack. This is the single largest blind spot in label reading, and it is why the processing agents section of this reference exists.

Bone char works the same way in sugar. Some cane sugar refineries use it as a decolourising filter. The sugar contains no bone, the label says sugar, and the only route to an answer runs through the brand. Beet sugar skips the process altogether.

The group that clears vegetarian and fails vegan

These come from living animals. This is where the two diets part company.

Ingredient	Code	Origin
Whey	—	Liquid byproduct of cheese and yogurt production
Casein	—	The main protein in cow’s milk
Lactose	—	The primary sugar in mammalian milk
Albumin	—	Most commonly egg white
Lanolin	—	Wax from the sebaceous glands of wool-bearing sheep
Beeswax	E901	Secreted by worker bees to build honeycomb

Whey is worth a closer look, because is whey protein vegetarian is one of the most searched versions of this question and the honest answer has a layer to it.

Whey is milk-derived, so it belongs in a vegetarian diet on the face of it. The complication is upstream: whey is what remains after milk is curdled to make cheese, and traditional cheesemaking curdles milk with rennet from a slaughtered calf’s stomach. A vegetarian who avoids animal rennet has a reason to care which cheese produced the whey. Most large protein powder manufacturers now use fermentation-produced chymosin, and many say so when asked, though few print it on the tub.

Shellac sits awkwardly in this table’s neighbourhood and belongs in its own line. Shellac (E904) is a resin secreted by the lac insect, and harvesting the resin kills insects in the process. Vegans exclude it without ambiguity. Vegetarians divide on it much as they divide on carmine.

The group that clears both

Most additives land here, which is worth saying plainly because the alarming lists that circulate online tend to obscure it. Of the 49 additives in this reference, 19 are plant-derived, mineral, or synthetic in every commercial form we could verify.

That includes many of the codes that sound most industrial: citric acid (E330), ascorbic acid (E300), xanthan gum (E415), pectin (E440), agar (E406), guar gum (E412), carrageenan (E407), and monosodium glutamate (E621).

MSG earns a special mention. It attracts more suspicion than almost any other additive and is produced commercially by bacterial fermentation of plant starch or molasses. The animal-origin worry attached to it is a persistent myth rather than a sourcing fact.

The group that refuses to answer

A final set carries the same E-number whether the raw material came from a plant or an animal. These are the ones that resist a quick label check, and they cover both diets at once — an animal-fat batch of E471 comes from rendered tallow, which fails vegetarian as well as vegan.

• E471 mono- and diglycerides — vegetable oils or animal fats
• E472e DATEM — built from E471, so it inherits the question
• E481 sodium stearoyl lactylate — stearic acid from either source
• E322 lecithin — soy, sunflower, or egg yolk
• E920 L-cysteine — feathers and hair, petroleum, or fermented corn
• E101 riboflavin — fermentation, or whey and egg white
• E160a beta-carotene — plants and fermentation, or fish oil in some grades
• E422 glycerin — animal fat, petroleum, or plant oils
• Vitamin D3 — lanolin from sheep’s wool, or lichen

These four — E471, E472e, E481, and E322 — account for most of the uncertainty in an ordinary supermarket, because they sit in bread, margarine, chocolate, ice cream, and baked goods. The full list of source-dependent additives covers the rest.

Why the label stays quiet

Under EU and UK rules an additive must be identified by its function and either its name or its E-number. Origin enters the picture only when the additive is also a listed allergen, which in practice means milk and egg.

That rule does more work than it first appears to. Bolded milk beside an emulsifier settles the question immediately. The same goes for egg. What it cannot do is flag tallow, because beef is not an allergen in EU or UK law, so a tallow-derived batch of E471 has no labelling duty whatsoever.

So allergen text is a reliable positive signal and an unreliable negative one. Its presence tells you something definite; its absence leaves the animal-fat question wide open.

A workable order of operations

1. Scan for the slaughter group first. E441, E542, E631, E635, and the plain-name entries — gelatin, tallow, isinglass, bone char. These decide themselves.
2. Check the allergen highlights. Bolded milk or egg resolves the dairy and egg group in one pass.
3. Note the four ambiguous emulsifiers. E471, E472e, E481, and E322 are the ones worth a message to the manufacturer.
4. Remember the invisible aids. Beer, wine, cheese, and cane sugar can carry animal processing without a word on the label.
5. Let a certification mark do the work. The Vegan Society Trademark and V-Label both audit the supply chain behind the additives, which settles every line above in one glance.

The takeaway

The split between vegetarian and vegan comes down to a short list. Dairy and egg derivatives clear one bar and fail the other. Slaughter-derived additives fail both. A handful of emulsifiers stay ambiguous by design, and a handful of processing aids never reach the label at all.

Learn the eight codes in the first table and the six in the second, and most labels resolve in a few seconds. The reference entries below carry the sourcing detail behind each one.