Whey is the liquid left when milk curdles, dried into powder. It is milk, so it is not vegan, and it hides in more than protein shakes.
Made fromMilk (curdling byproduct)
Common inProtein powder, chocolate, snacks
VerdictNot vegan
Where it hides
Whey protein powders
Milk chocolate and some dark
Bread, crackers and snacks
Some margarines and dips
What it is
Whey is what remains after milk is curdled and the solid curds are removed for cheese: a watery, protein-rich liquid that is dried into whey powder and whey protein. It is milk by another name, which is why it sits on the US major-allergen list as a milk-derived ingredient and why it is not vegan.
Where it hides
Beyond the obvious tub of protein powder, whey turns up in milk chocolate and even some bars labelled dark, in breads and crackers for browning and texture, and in savoury snacks and dips. It often travels with casein and lactose, so spotting one is a good reason to read for the other two. Pea, soy, rice and hemp proteins are the vegan swaps for whey powder.
Casein and caseinateCasein is milk protein, and it turns up in surprising places, including some non-dairy creamers and a few plant-styled cheeses.
LactoseLactose is milk sugar. Even though it is a carbohydrate rather than a protein, it comes from milk, so it is not vegan.
Protein on a vegan dietThe Evidence · The 'where do you get your protein' question has a boring, well-documented answer: from plants, across the day, and the complete-versus-incomplete framing was retired years ago.
Frequently asked
Is whey protein vegan?
No. Whey protein is made from milk. Vegan protein powders use plant proteins such as pea, soy, rice or hemp instead.
Is dark chocolate vegan?
Often but not always. Plenty of dark chocolate is dairy-free, but some contains milk fat or whey, and many are made on shared lines. The ingredient list and any vegan label are the check.
Definition of veganism · The Vegan Society, 2024 · vegan diet excludes all products derived from animals
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