Because I have thick hair strands I don't use much protein. I don't believe all of the SM products have protein. I'm using the Purification Mask and it works well for me. I also liked the restorative shampoo but that deep treatment masque was the devil, it made my hair feel horrible. The coconut & hibiscus line didn't do anything for my hair. I believe the yucca line has protein, it's thickening. Anything that says strengthening or thickening I stay away from because it usually has protein in it.