There are lots of dandruff shampoo available in the market. My friend suggested me to use the Neutrogena t gel shampoo for this and I want to know what is the difference in Neutrogena t gel shampoo and other shampoo that are available in market. I am asking this because I have tried many shampoos but they really did not work for me. So before I spend my money and time on trying this I first want to know how it is different from other shampoo. What are the chemicals used in making this? What is the process of its manufacturing?