I've been using it as a leave in treatment after I wash my hair... my hair has gotten MUCH stronger and I thank Mega Tek for that ... I know people talk about the protein making your hair brittle, but IMO it's about finding a balance and seeing what works for you. I've done it all, used it as a DC (I felt it did absolutely NOTHING for my hair), applied it to my scalp (once again, nothing...) and leave in which I prefer. I only apply it after I wash my hair (which varies from 1-3 times a week) on damp towel dried hair.
HTH