Loreal Professional Expert Vitamino Colour Shampoo

I use the Loreal Proffesional for fine hair (it comes in a green bottle). It is amazing, i always have a problem with "flat" hair , except for when i use this shampoo& conditioner, my hair then looks full, shiny and i dont need to add hairsprays to try and get volume. I only have ever seen this sold at our salon, and it is quite pricey for monthly purchase, therefore i only use when i am going out.