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The Living Proof Perfect Hair Day (PhD) Shampoo is a hydrating and perfecting hair product that delivers a beautiful shine and healthier-looking hair. Lulu, the reviewer, highlights its sulfate-free, silicon-free, and color-safe formula. Lulu has been using this shampoo for a while, having gone through multiple bottles. The scent is amazing, and despite the small size, the shampoo lasts a long time. Lulu mentions that the conditioner is used up faster. The shampoo not only provides a nice shine but also leaves the hair feeling and looking good. Overall, Lulu's review emphasizes the positive aspects of the PhD Shampoo, making it an appealing choice for those seeking hydrated and perfected hair.