Pharmacist John Horlicks made this to help infants with growth and vitamins. It was used as a type of formula for them. Instead he made malted milk powder
It is made with malted barley, whole milk, wheat flour, and is evaporated until it is made into a powder. It is a key ingredient in most store bought or restaurant made milkshakes.
Malted milk powder can be found in most stores in the tea and coffee section. This ingredient makes for a killer old fashion milkshake but if you want a more modern take check out the milkshake recipes in the next bubble of my Prezi.