This product was recommended to me by a friend when I mentioned having a problem with more-than-usual hair loss. I've now used it 4-5 times, and, so far, I'm loving it. I've been using it at night, focusing on my scalp when applying, but then running it through the length of of my hair and leaving it overnight. It's not difficult to wash out in the morning, and I seem to be losing less hair. My hair seems to feel healthier, as well, so I'm very happy with my purchase. Since it uses quite a bit to apply it the way I am, I'll probably eventually move it to using it primarily on my scalp, but for now, I'll continue enjoying the benefits I'm getting.