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Perhaps it’s different outside the US but the mid-priced mass market shampoos are really the best performers in all measurable areas. I’ve done dozens of blinded consumer tests and consistently found that the best & most preferred shampoos was Pantene. Fructis & Tresemme also scored very high. What didn’t score high were expensive salon brands.
SLS is not the problem.In my research I’ve found that If you are using a conditioner the shampoo you use does not really matter. You can test it yourself. Get 5 different shampoos, 5 hair tresses and one conditioner. Wash each tress with one type of shampoo and use the same conditioner on each tress. If you do it on a blinded basis you will be hard pressed to see any differences.Co washing is just a marketing gimmick “discovered” by people who forgot to wash their hair and embraced by stylists who thought anything with the word sulfate in it was awful. Sulfates are not awful & you can formulate perfectly fine products using sulfates.Interestingly, when this co-wash trend started about 10 years ago the go to product was VO5 Conditioner, a simple Cetrimonium Chloride based conditioner with no silicones.