The authors introduced in this article the basic formulation principles of hair shampoos with emphasis of key points from their years of working experience in this field such as the selection of conditioners and their impact on performance of hair shampoos, the selection of viscosity stablizers for a steady fluidity appearance during the shelf life, as well as on how to choose a proper antidandruff agents etc. Testing methods on evaluation of conditioners, antidandruff agents and viscosity stabilizers wer...