I tried some of this leave-in with keratin and it's amazing. I accidentally washed my piece a few times with a sulfate based baby shampoo (I didn't read the label and mistakenly thought that all baby shampoos were sulfate free) and my piece got very dry and looked dull and thin. After 1 application of this product it brought back about 80% of the softness, shine, fullness, and body that I had lost from the shampooing. The reviews say that your hair gets better with repeated use. This stuff is amazing! Great find Paul! Everyone should try this stuff!