Cell Based Milk
The basics

Is cell-based milk vegan?

No cows are milked, but the cells came from one. Whether that counts as vegan depends on how you define the word.

Updated 3 min readBy the Cell Based Milk team
Illustration of a milk drop beside a leaf

Key takeaways

  • Strictly speaking, cell-based milk is an animal product: it's made by animal cells and contains animal proteins.
  • It may still fit many vegans' ethics, because it can drastically reduce or eliminate ongoing harm to animals.
  • Key questions are how the cells were obtained and whether the growth media contains animal-derived ingredients like fetal bovine serum.
  • Don't expect a vegan label. Certifiers have approved precision-fermented proteins, but cell-cultured milk is a harder case.

It’s one of the most common questions about cell-based milk, and there’s no single answer. It depends on what “vegan” means to you: avoiding animal products, or avoiding animal harm.

The case that it isn’t vegan

Cell-based milk is, by design, a real animal product. It’s made by cow mammary cells and contains the same casein, whey, fat and lactose as conventional milk. If your rule is “no animal-derived ingredients, full stop,” it doesn’t qualify.

There’s also the question of origin. The first cells had to come from an animal, through a tissue biopsy or isolated from milk. And historically, many cell cultures have been fed fetal bovine serum (FBS), which is collected from calf fetuses at slaughter. A product grown with FBS would be hard to call vegan by any definition.

The case that it fits vegan ethics

Many people are vegan primarily to avoid animal suffering and exploitation. Through that lens, cell-based milk looks very different from conventional dairy:

  • No herds. No repeated pregnancies, no separating calves from mothers, and no culling of cows once their milk yield drops.
  • Few or no new animals. Companies that develop immortalized cell lines can keep the same cells going indefinitely. Opalia describes working with an immortal cow mammary cell line, which means it doesn’t need to keep returning to animals.
  • Serum-free media. Most food-focused companies are moving away from FBS, partly because it’s expensive and partly because it contradicts the animal-free pitch.

A product made from a long-established cell line in serum-free media involves, at most, a single biopsy from one animal years ago. For many ethically motivated vegans, that’s a very different proposition from a dairy farm.

What certifiers have done so far

Vegan certifiers have approved some animal-free dairy, but only proteins made by microbes. TurtleTree’s precision-fermented lactoferrin, for example, received Vegan Action certification in 2023. In precision fermentation, a microbe makes the milk protein, and no animal cells are involved at any stage.

Cell-based milk is a different case because the producer is an animal cell. We’re not aware of any cell-cultured milk product carrying a vegan certification, and none is on the market to certify yet. Expect companies to describe their products as “animal-free” or “cow-free” rather than “vegan.”

Questions to ask about any product

When cell-based milk reaches stores, these questions will tell you whether it fits your values:

  1. Where did the cells come from? A one-time biopsy, an immortalized line, or repeated sampling?
  2. What’s in the growth media? Is it serum-free and free of other animal-derived inputs?
  3. Were any other animal ingredients added? For example, components added back to match conventional milk.
  4. Is it certified? Look for third-party certifications rather than marketing language alone.

So, is it vegan?

Not by the strictest definition, since it’s an animal product. But it may be vegan-compatible for people whose main concern is animal welfare, particularly if it’s made from an established cell line with serum-free media.

If you’re vegan for allergy or dietary reasons, it’s a clear no: cell-based milk contains real milk proteins. See our guide to lactose intolerance and milk allergy.

For more on how the different technologies compare, read cell-based milk vs. precision fermentation.

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