Once the whey and curds have been separated, the mixture is fltered and neutralized using citric acid. Continuous fltration of this liquid whey concentrates its protein percentage. Further microfltration boosts protein concentration up to 90%. The liquid whey solution is warmed & spray dried to become a raw whey protein powder or whey concentrate and includes a small amount of fat and carbohydrates (in the form of lactose).
Whey isolate is a variation of whey protein, where water is removed along with most of the lactose and fat to give a 95% protein concentration. Whey hydrolysate, is partially pre-digested with enzymes. This enzymatic pre-digestion is applied to break down some of the amino acid peptide bonds into shorter chains, which accelerates absorption and amino acid availability in the body. Whey protein hydrolysate is commonly suggested to be the optimal form of whey protein where fast absorption is needed (such as directly after a workout).