The Protein Works 100% Micellar Casein

£22.99 (33 servings), theproteinworks.com

Casein is a slow-release protein for sustained release of amino acids, making it perfect for taking just before bed, to keep your muscles fuelled as you sleep. The Protein Works’ offering is 100 per cent ultra-fine casein, with 24g protein per serving and a delicious, silky, creamy texture. It works well in protein-powder recipes, too.