I’m leaning more toward pureology … 2 … Living Proof Perfect Hair Day (PhD) Shampoo. I don’t personally know anything about living proof so I won’t be too much help there … Been looking mostly at pureology vs. living proof. Pureology’s Nano Works Shampoo cost $46.14 for 8.5 ounces, or $5.43 per ounce. I have been researching this same topic all week!! Previously tried products: Nioxin system Garnier fructis OGX Fekkai Pureology Bedhead tigi Paul Mitchell. I have always just bought a cheap drugstore shampoo and conditioner, but I’ve recently been contemplating spending a little more on a higher quality brand. There are other size options that increase the cost by $40-60. I haven’t had as good results with anything except for living proof, and I’m about to run out. Hydrate me line by pureology is fantastic however it’s more for a daily use on hair that doesn’t need a lot of maintaining. Simply slather this one from Living Proof all over your ends before bed and let it soak in and do all the work while you doze. This is one of the most expensive shampoos I have ever laid … Thanks! ... Pureology Hydrate Shampoo. You'd be hardpressed to find something to dislike about this salon staple.