Milk shakes have been enjoyed since the early 1900s, and were originally made by mixing milk with chocolate, strawberry, or vanilla syrups. Home-made shakes are made with blenders which gives them whipped, aerated and frothy characteristics. Shakes can be made using milk, ice-cream or iced milk, with the addition of flavourings or sweeteners such as fruit syrup or chocolate sauce. Many retail shakes look to re-create this whipped and light texture utilising a head space in the bottle that allows an increase in volume upon shaking. Stabiliser systems will then look to maintain this texture and volume whilst consumed.