Fret not, as we will discuss the basic points you will need to know when choosing a protein. First of all you must know the different types of protein available on the market. The other type of high quality protein available is soy. The quality of soy protein varies greatly depending on the degree of processing. For the moment we will focus on the milk proteins and discuss soy later.
Milk protein has two basic components, whey and casein.
Whey and casein can be seperated and made into powdered products or they can be processed together producing a milk protein powder. Milk protein concentrate is basically whey and casien together as you might find in regular cows milk. The difference here being that the lactose and fat content have been filtered out to make a lower fat, lower carbohydrate, powder. Milk protein isolate has a low amount of fat and lactose. The higher the protein content, the more processing, the higher the cost to the manufacturer.