Whey Protein > What and Source Recommendation.

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Whey protein is a mixture of proteins isolated from whey, the liquid material created as a by-product of cheese production. 

The proteins consist of α-lactalbumin, β-lactoglobulin, serum albumin and immunoglobulins. 

Whey protein is commonly marketed as a dietary supplement, and various health claims have been attributed to it. 

For muscle growth, whey protein has been shown to be slightly better compared to other types of protein, such as casein or soy.

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The protein in cow's milk is 20% whey and 80% casein. The protein in human milk is 60% whey and 40% casein. 

The protein fraction in whey constitutes approximately 10% of the total dry solids in whey. 

This protein is typically a mixture of beta-lactoglobulin (~65%), alpha-lactalbumin (~25%), bovine serum albumin (~8%) (see also serum albumin), and immunoglobulins. These are soluble in their native forms, independent of pH.....Wikipedia