Hydrolyzed whey protein

I would just google your question...

"Hydrolyzed protein is protein that has been hydrolyzed or broken down into its component amino acids. While there are many means of achieving this, two of the most common are prolonged boiling in a strong acid (acid-HVP) or strong base or using an enzyme such as pancreatic protease to simulate the naturally occurring hydrolytic process.

Because whey is derived from cow’s milk, people with difficulty digesting lactose or with cow's milk allergies typically avoid it. Whey concentrate powders contain less lactose than milk and are often easier for people with mild lactose intolerance to digest, but they may not be suitable for those with severe lactose intolerance.

Extensively hydrolyzed whey, on the other hand, is less likely to cause allergic reactions and may also be lactose-hydrolyzed. Highly hydrolyzed whey was found to produce no ill effects for more than 90 percent of child subjects with a cow’s milk allergy, according to a clinical trial published in the journal “Pediatric Allergy and Immunology” in 2001."