Why does nitro cold brew taste creamy even though there's no cream in it?

Answer: Tiny nitrogen bubbles

Frozen coffee oils — Not quite. Coffee oils and colloids can affect mouthfeel, but frozen oil is not the signature mechanism. Nitro is served cold, not frozen solid, and the cascade comes from gas leaving solution after pressure changes. The smaller, denser bubbles are what make the drink feel velvety.

Hidden milk proteins — Not quite. Plain nitro cold brew does not need milk proteins to make a creamy head. Some cafe drinks add cream or cold foam, but the base nitro effect comes from gas bubbles and dispensing. That is why it visually resembles stout beer even when the ingredient list is just coffee, water, and nitrogen.

Tiny nitrogen bubbles ✓ — Right. Nitro cold brew changes texture more than basic chemistry: nitrogen gas forms fine bubbles and a foam head, which the mouth reads as creamy. Foam research on nitrogen-infused cold brew measures how roast, brew temperature, ratio, particle size, and serving temperature affect foam stability. It is a physics trick, not dairy.