Instead, the fast-food chain sells "shakes" — something that has lead to countless conspiracy theories.
Are the shakes actually dairy-free? Filled with potatoes? Stuffed with something disgusting like styrofoam, seaweed, or cow eyeball fluid?
According to a spokesperson at the fast-food chain, customers have nothing to fear. While McDonald's shakes can't technically be called "milkshakes" in some states, the company isn't sneaking cow eyeballs into your desserts.
"Our shakes contain milk from our reduced-fat, soft serve, which makes them thick and creamy," a McDonald's spokesperson told Business Insider. "Dairy regulations actually vary from state to state on what can officially be called a 'milkshake.' We like to keep it simple and refer to them strictly as 'shakes.'"
According to fact-checking website Snopes, there is one McDonald's shake rumor that has a hint of truth. McDonald's soft serve contains carrageenan, a natural substance which is derived a type of seaweed — a safe and all-natural ingredient that is commonly used by frozen treat makers.