Gelatin

Gelatin is collagen that has been extracted from animal skin, bone and connective tissue and broken down until it dissolves in hot water and sets as it cools. That setting behaviour is why it is in gummy sweets, marshmallows, mousses, some yoghurts, jelly, and the capsule shells of a great many supplements and medicines.

It is almost always from pigs or cattle. Fish gelatin exists and is used where pork must be avoided, but it is the exception.

Why it is hard to spot

Not because it is hidden. Gelatin is declared like any other ingredient. The difficulty is that it appears in products nobody thinks to check.

A fruit-flavoured sweet reads as a plant product. A low-fat yoghurt reads as dairy, and dairy is fine for vegetarians, so the gelatin used to thicken it goes unexamined. A vitamin capsule reads as a vitamin. In all three cases the animal ingredient is structural rather than the point of the product, which is exactly why it slips past.

The other difficulty is that the label rarely tells you which animal. “Gelatin” satisfies the ingredient declaration rules on its own. If you need to know whether it is porcine or bovine, for religious observance or otherwise, the ingredient list is usually not enough and the manufacturer is the answer.

Vegetarian, vegan, and the gap between them

Gelatin is not vegetarian, and this surprises people regularly. Vegetarian diets exclude animal flesh, and gelatin is made from parts of a slaughtered animal, so it falls outside the definition even though it is not meat in the everyday sense.

There is no legal definition of “vegetarian” or “vegan” on a food label in most markets, which is the whole problem and is covered on the page for people avoiding animal ingredients. Certification schemes exist precisely because the words themselves do not constrain anyone.

What replaces it

Pectin, from fruit. Agar, from seaweed. Carrageenan, also from seaweed. Starches and modified starches. Products using these are usually happy to say so on the front, since it is a selling point.

That is a useful signal in reverse: a gummy sweet that says nothing about being vegetarian on the front usually contains gelatin, because the manufacturers who avoid it advertise the fact.

Is there a safety question

Not really, and it is worth saying so plainly rather than leaving a vague unease. Gelatin is a protein people have eaten for centuries. Allergy to it exists and is uncommon. The reason this page exists is not safety. It is that a great many people are avoiding it for reasons that have nothing to do with toxicology, and the label makes that harder than it should be.