Thanks for making me look this up. I was curious since my wife can't eat dairy proteins (not as a severe a reaction fortunately). I think that it was probably w

Thanks for making me look this up. I was curious since my wife can't eat dairy proteins (not as a severe a reaction fortunately). I think that it was probably whey. There are some companies that have claimed to create whey that is identical to milk whey from vegan sources [0]. It makes me wonder how the ingredients list is labeled though. Since there are requirements to call out allergic sources in ingredients lists (it will say something like "Contains Milk" or "Allergy Warning: Milk, Tree Nuts") how or if it is listed on there. EDIT: On the Perfect Day website there is a small warning at the bottom that says "Our protein is a milk allergen". Also found some Brave Robot ice cream that uses their protein listed online at my grocery store. Under the Allergen Info it does say "Contains Milk and its Derivatives". Also while looking around found that for casein, it is still used in some glues [1] on bottle packaging. Likely not the source since it wasn't ingested more of an interesting factoid. [0] https://perfectday.com/animal-free-milk-protein/ https://perfectday.com/animal-free-milk-protein/ [1] https://en.wikipedia.org/wiki/Casein#Glue https://en.wikipedia.org/wiki/Casein#Glue