Whey protein is one of the highest biologically available proteins on the market, its broad yet dense amino acid content makes it first choice for most embarking in health, fitness and sporting activity. The processes involved in manufacturing whey protein powder means the amino acid profile of milk is concentrated into a powder form, meaning you get more protein per gram than you would in ordinary milk…plus it tastes great!
The U.S. Department of Agriculture Nutrient Database explains that any type of milk, irrespective of the fat content contains 18 amino acids comprising all 9 essential amino acids, 6 conditionally essential including arginine, cysteine, glycine, proline, serine and tyrosine, as well as 3 non-essential, alanine, aspartic acid and glutamic acid.
The beauty of whey protein is that it has also had most/all of the fat and excess carbohydrates removed, leaving you with nothing but protein (or as near as dammit).
U.S. Department of Agriculture Nutrient Database, (2013). Amino acid profile of milk. Retrieved 16th August, 2013, from http://ndb.nal.usda.gov/ndb/foods/show/69?fg=&man=&lfacet=&count=&max=&sort=&qlookup=&offset=&format=Full&new=