Really does help hair appear thicker and more lustrous. When used in conjunction with the shampoo and conditioner of the same line, you will notice the difference to your hair after the first wash! I would recommend using the masque once every two weeks as to not weigh down the hair. But this would also depend on your hair type. I have very dry, very curly hair which i flat iron every other day. So i could probably use it more often, but its been working fine for me as is.