Well, I'm particularly fond of Cocoa Keratin System, it's a Brazilian keratin treatment that comes with the pre-treatment shampoo, smoothing treatment and daily shampoo and conditioner. I like it because the treatment lasts up to 5 months and its very safe on my hair, giving it nutrients, moisture and smoothing it down. The protein and argan oil help immensely and strengthen my hair while making it super shiny. I recommend it