Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Fast delivery exactly what I ordered. I have been using this Matrix Biolage ColprLat Shampoo and Conditioner for more than a year. Previously, my hair was dry and damaged because of all the hair colour and treatment over the years. This shampoo and conditioner fixed it and made my hair healthy and shiny again.