I had high hopes for this shampoo. Did not work well. When I was washing my hair with this it made it feel sticky and became instantly ratty. After using a deep conditioner after, I still could hardly get a brush through my hair. As far as helping dandruff goes, didn't do anything. I would recommend Paul Mitchell Tea Tree shampoo before even trying this. And it's cheaper!
This dandruff shampoo is pricier than what you can get at the drug store but works better. The 1% active ingredient, Pyrithione Zinc, can be found in other over-the-counter shampoos but I have not had the same results with them. I have tried just about everything you can find in non-prescription treatments and this one is the best one for me. I am not sure if Redken uses less irritating non-active ingredients, or if their success is based on another approach with this product but it works.