People keep asking us: Does Starbucks use lab-grown milk? Does Starbucks use fermented milk? Is there Perfect Day milk hiding in your latte under another name? The answer, as of October 2026, appears to be no. Starbucks is not currently serving precision-fermented, animal-free or “lab-grown” milk as a standard milk option.
But Starbucks has tried it before. In 2021, Starbucks tested animal-free milk made with Perfect Day protein at two locations near Seattle, in Bellevue and Renton, Washington. Perfect Day uses precision fermentation to make whey protein without raising a cow. For the Starbucks experiment, a special 2% “barista blend” was developed that could be steamed and foamed for coffee drinks.
That test seems to be the source of some of the confusion today. What milk does Starbucks use now?
Is Starbucks using fake milk or fungus milk in 2026?
No published Starbucks U.S. menu or ingredient information we found identifies lab-grown milk as a standard option. That includes milk marketed as animal-free, fermentation-made or “fake milk.” The company’s protein drinks and protein cold foam should not be confused with precision-fermented dairy: the whey-containing products Starbucks describes use a dairy base, with no claim that the whey is animal-free.
“Fungus milk” is another name people search for. It describes a way of making dairy proteins using fungi or other microorganisms, not milk made by squeezing mushrooms. No credible current evidence shows Starbucks putting it in ordinary lattes without telling customers.
Starbucks’ current U.S. information lists conventional dairy milk alongside oat, almond, coconut and soy milk. Starbucks (sued for overpricing specialty milk) also offers a protein-boosted milk made from 2% dairy milk and whey protein. The company does not identify that whey as precision-fermented or animal-free.
We could find no current Starbucks announcement, ingredient information or menu listing showing Perfect Day, Remilk, Imagindairy or another precision-fermentation dairy protein being served in Starbucks drinks. We have reached out to Starbucks for comment about any future plans.
We did not find evidence that Starbucks is quietly buying one of these proteins and selling it under a bespoke or white-label milk brand. That’s worth saying because the technology itself hasn’t disappeared.
Perfect Day continues to market an animal-free barista milk for food service. Green Prophet has also been following companies such as Remilk which we’ve tried (tastes like coconut, but is refreshing) and Imagindairy as precision-fermented dairy moves from food-tech laboratories toward real commercial products.
“Lab-grown milk” isn’t quite the right term, incidentally. These companies generally use precision fermentation: microorganisms are programmed to produce proteins such as whey that are essentially the same proteins found in cow’s milk. No cow needs to produce the protein. The finished product can be formulated to taste like conventional milk, although flavour depends on what else goes into the recipe.
What is lab-grown milk, and how is fungus milk made?
Think of brewing beer or making cheese rather than growing something mysterious in a petri dish. In precision fermentation, carefully selected microorganisms are given instructions to make a specific protein, such as whey. The organisms grow in controlled tanks, and the protein is then separated and purified. Manufacturers can blend it with water, fats and other ingredients to make a creamy drink.
The technique is related to established food processes used to make fermentation-produced chymosin, the enzyme that helps milk turn into cheese, as well as certain vitamins and food ingredients. It’s industrial biotechnology, but not inherently more alarming than the complicated processes already behind everyday supermarket foods (Twinkies!). The difference is that these microorganisms make a milk protein, without milking a cow.
Is lab-grown milk safe to drink?
There is no good reason to assume that properly manufactured animal-free dairy is unsafe simply because fermentation is involved. Perfect Day’s fermentation-produced whey was the subject of an FDA GRAS notice, and the agency responded with no questions about the company’s safety conclusion for its intended uses. That is not a blanket approval of every lab-grown milk brand or recipe. As with any manufactured food, hygiene, ingredients and quality controls matter.
One important exception: animal-free does not mean allergy-free. If the product contains whey identical or very similar to cow’s milk whey, someone with a milk-protein allergy may react to it. Check the package for a milk allergen declaration, even if it says vegan or cow-free. See Perfect Day’s explanation of milk allergies and its FDA safety-notification history.
Is animal-free milk vegan, and does it contain cow hormones?
For many vegans, the appeal is obvious: the familiar experience of real dairy protein without relying on cows. Other vegans may have different views about food produced with genetically engineered microorganisms. The animal-free whey itself can be produced without cows, but you’ll still want to check the other ingredients in any finished drink.
Perfect Day says its purified whey protein is free of lactose, hormones, cholesterol and antibiotics. That’s interesting if you love the taste of milk but would prefer not to consume cow-derived ingredients. It doesn’t follow that every drink made with animal-free whey is automatically hormone-free, lactose-free or healthier: those claims depend on its full formulation. Lactose intolerance is also different from a milk-protein allergy.
Does fake milk taste like real milk in coffee?
It can. A reviewer who tried the 2021 Perfect Day Starbucks trial compared two caramel macchiatos and reported that the animal-free version frothed and tasted almost indistinguishable from conventional milk. That’s one person’s taste test, not a guarantee for every brand, but it shows why baristas are interested. Unlike oat or almond milk, precision-fermented dairy can include the very whey proteins that give ordinary dairy some of its texture and foaming behaviour.
For someone who likes a real cappuccino but doesn’t want the cow, that’s potentially exciting. For someone who’d rather stick with oats, almonds or straight black coffee, those choices aren’t going anywhere.
So if you’re standing at Starbucks wondering whether your latte contains secret lab milk, the evidence today says no.
Related: Olive oil and coffee trends
For my money, there’s another option. Buy good fair-trade coffee, grind enough for one cup, put it in a simple drip filter and pour hot water over it. It takes about three minutes and, honestly, makes some of the best coffee there is. No line, no app and no need to investigate the biotechnology behind your latte. And you can milk the cow or goat living in your backyard.
Updated October 20, 2026 with answers to reader questions about fake milk, fungus milk, hormones, vegan ingredients and food safety.
