Reflex Natural Whey has one of the highest biological values of any protein supplement on the market due to its excellent amino acid profile, protein fraction content and superior digestibility. Natural Whey contains the highest concentration of Branch Chain Amino Acids (B.C.A.A) when compared to other protein sources. Reflex Natural Whey has one of the highest biological values of any protein supplement on the market due to its excellent amino acid profile, protein fraction content and superior digestibility. Natural Whey contains the highest concentration of Branch Chain Amino Acids (B.C.A.A) when compared to other protein sources.