McDonalds publish their ingredient lists.

Dairy Mix Milk ingredients: sugar, modified milk ingredients, glucose, soy mono and diglycerides, guar gum, dextrose, artificial vanilla flavour, carrageenan, cellulose gum.

Triple Thick Chocolate Shake Syrup: Glucose-fructose, water, dutch processed cocoa, natural (vegetable source) and artificial flavour, salt, potassium sorbate.

Just like you make at home!