there are significant price and nutritional value differences between the various whey protein powder supplements on the market. One containing 34% protein may cost up to 80% less than better quality whey protein powders with protein contents of 77% or higher. Most whey protein powders use a blend of different whey protein concentrates, isolates and hydrolysates, making it possible to hide inferior/cheaper proteins in a product. There's a way to find out. To figure out the overall protein percentage of your supplement, whey or otherwise, simply divide the protein found in each serving by the serving size and multiply by 100.
Example to help you figure out how much of your current whey protein powder actually protein is whey: protein: 22g of protein per serving — 28.4g serving size x 100 = 77.5% The higher the number the better but you will never see 100%.