Natural Factors Whey Factors Protein Powder Unflavoured, 1kgNPN#80071971 For more information CLICK HERE Considered the gold standard for athletes and the physically active, it is well known that whey protein has the highest biological value, a measurement of how well a protein retains nitrogen or how usable it is to the body, as high nitrogen absorption enhances muscle gain. Compared to other proteins, whey contains the highest concentration of branched chain amino acids (BCAA) that serve as important fuel