For years, researchers and bodybuilders alike have argued the relative merits of [1] different kinds of protein. But now, for the first time, there’s mounting scientific evidence that favors one type of protein over others. This distinction is of vital importance for athletes, because when it comes to resistance exercise (such as weight lifting), [2] supplementing your diet with the highest-quality protein available is absolutely essential to reducing protein breakdown and ensuring proper transport of amino acids into skeletal muscle. In short, the quality of protein ingested is vitally important for optimum protein synthesis and resulting muscle gain.

Armed with this knowledge, athletes can now ensure that they’re getting the most mass-building value when they choose whey protein isolate. Even better, a related breakthrough in bioavailability enhancement (Arginine AKG) is about to usher in an entirely new era in "super proteins." But we’ll get to that later.

Why One Whey is Better than the Others
The method of determining protein quality is referred to as the biological value (BV), and of the two main proteins-casein and whey-whey protein has the highest BV score of 100. Along these lines, there are two primary types of whey protein to consider: Whey Concentrate and Whey Protein Isolate (WPI). Whey concentrate is generally considered a lower-grade form of protein because it contains higher amounts of fat and lactose, more impurities and has less biological value. Unfortunately, most protein products on the market contain whey concentrate. Conversely, whey protein isolates have proven to be superior to concentrates and other proteins primarily because whey isolate contains:
[3]

• the highest percentage of pure protein
• more amino acids & BCAA’s
• greater bioavailability
• little or no carbohydrates
• little or no lactose
• no impurities
• the highest levels of critical anabolic microfractions

Based on these criteria alone, whey protein isolate is clearly the [4] superior protein and offers the greatest opportunity
for maximum muscle growth.

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