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Is it vegan?

Last reviewed August 22, 2026

Condoms

Most latex condoms are made using casein, a milk protein, to smooth and stabilise the rubber during manufacturing. A small number of brands leave it out and label themselves vegan.

Where it hides

  • Standard latex condoms, unless the box says vegan
  • Latex gloves, balloons and dental dams made the same way
  • Not listed on the packaging or in an ingredient list
  • Non-latex polyisoprene and polyurethane condoms skip this step

What's actually in a latex condom

Natural rubber latex starts as a plant product: the milky sap tapped from a rubber tree. That part is not the problem. The problem sits in how the latex becomes a smooth, dip-moulded film strong enough to pass safety testing, and one common additive for that job is a milk protein. A patent filed by a condom manufacturer describes it plainly.

Primary source 01 / 02

One such additive is casein - a protein derived from cow's milk (animal protein)- which is added as a thickener or binding agent at the stage of preparation of rubber compound.

TTK Protective Devices Limited condom manufacturer, patent filing A process of manufacturing dipped latex products without using animal derivatives and products thereof, 2017

That one ingredient does two jobs: it binds the rubber compound together and thickens it to a controlled, even coating. Manufacturers who leave it out have had to engineer around the resulting drop in yield and in the burst-pressure rating condoms must meet under ISO 4074:2014, the international safety standard, which is a large part of why casein has stayed the industry default.

How to check what's in yours

Casein never appears on a condom box, because a condom is a medical device rather than a food, and a processing aid rinsed away before packaging has no labelling requirement. The reliable signal is the brand's own claim.

Primary source 02 / 02

One of the most well-known examples is casein, a milk protein that has traditionally been used in the production of many latex condoms.

GLYDE vegan-certified condom manufacturer What Being Vegan Means For Us, 2026

That particular brand replaces casein with a plant extract from thistle. If a box doesn't make a vegan claim, the honest assumption for a standard latex condom is that casein was used somewhere in the process, even though almost none of it survives into the product you actually use.

  • Casein and caseinate Casein is milk protein, and it turns up in surprising places, including some non-dairy creamers and a few plant-styled cheeses.
  • Tattoo ink Tattoo ink is pigment suspended in a carrier, and the carrier is where an animal ingredient is most likely to hide. Glycerine can come from an animal or a plant, and most brands don't say which on the bottle.

Frequently asked

Do condoms contain milk?

The finished condom doesn't meaningfully contain milk, but many are made using casein, a milk protein, as a processing aid. It helps bind and thicken the rubber compound and isn't usually disclosed on the box.

Are non-latex condoms vegan?

Usually, on this specific point. Polyisoprene and polyurethane condoms are synthetic and skip the casein-based latex process, though it's still worth checking that the lubricant hasn't used an animal-derived ingredient.

How do I find a vegan condom brand?

Look for a brand that states it explicitly, ideally with a Vegan Society or V-Label mark, and names its casein alternative. Without that claim, assume a standard latex condom used casein somewhere in production.

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