Hydrolysed whey protein is an very pure form of whey protein. Hydrolysed Whey Protein is made through a process known as hydrolysis, where the protein chains are broken down into smaller segments by using treatment with enzymes. This produces much smaller protein particles called peptides which are easily absorbed in the body.
This means that hydrolysed whey protein has a much faster rate of digestion and absorption. Hydrolysed whey protein is therefore often used to improve the recovery and protein synthesis process needed after a workout.